Pipes and Cisterns, Time Speed and Distance, Boats and Streams - One Line Questions
1.
A boat can travel at 15 km/hr in still water. If it takes 5 hours to travel a certain distance downstream and 7 hours to travel the same distance upstream, what is the speed of the stream? —
2 km/hr
2.
A train crosses a pole in 9 seconds and a platform 200 meters long in 21 seconds. What is the speed of the train? —
10 m/s
3.
Two pipes P and Q can fill a tank in 15 minutes and 20 minutes respectively. Both pipes are opened together, but P is closed 5 minutes before the tank is full. How long does it take to fill the tank? —
12 minutes
4.
Two taps A and B can fill a tank in 40 minutes and 60 minutes respectively. Both taps are opened together. After how much time should tap A be closed so that the tank is filled in 30 minutes? —
20 minutes
5.
A train traveling at 60 km/hr crosses a platform in 10 seconds. If the length of the train is 150 meters, what is the length of the platform? —
250 meters
6.
A train travelling at 54 km/hr crosses a platform in 20 seconds. If the length of the train is 150 meters, what is the length of the platform? —
150 meters
7.
A train travelling at 90 km/hr crosses a bridge in 10 seconds. What is the length of the bridge if the length of the train is 150 meters? —
125 meters
8.
Pipe X can fill a tank in 6 hours and Pipe Y can empty it in 8 hours. If both pipes are opened simultaneously, in how many hours will the tank be filled? —
24 hours
9.
Pipe A can fill a cistern in 5 hours. Pipe B can empty the same cistern in 4 hours. If the cistern is full, and both pipes are opened, how long will it take to empty the cistern? —
20 hours
10.
Pipe A can fill a cistern in 4 hours. Pipe B can empty the same cistern in 5 hours. If the cistern is full, and both pipes are opened, how long will it take to empty the cistern? —
20 hours
11.
A boat can travel downstream at 25 km/hr and upstream at 15 km/hr. What is the speed of the boat in still water? —
20 km/hr
12.
Two pipes A and B can fill a tank in 24 minutes and 36 minutes respectively. Both pipes are opened together, but Pipe B is closed 6 minutes before the tank is filled. How long does it take to fill the tank? —
18 minutes
13.
A train passes a man standing on a platform in 10 seconds and passes the platform completely in 25 seconds. If the length of the train is 150 meters, what is the length of the platform? —
225 meters
14.
A train travelling at 72 km/hr crosses a bridge in 15 seconds. What is the length of the bridge if the length of the train is 100 meters? —
200 meters
15.
A train passes a man standing on a platform in 8 seconds and passes the platform completely in 20 seconds. If the length of the train is 120 meters, what is the length of the platform? —
180 meters
16.
A boat travels upstream for 2 hours and covers a distance of 10 km. It travels downstream for the same amount of time and covers a distance of 26 km. What is the speed of the boat in still water? —
16 km/hr
17.
Pipe A can fill a tank in 20 minutes, and Pipe B can fill it in 30 minutes. An outlet Pipe C can empty the tank in 40 minutes. If all three pipes are opened together, how long will it take to fill the tank? —
17 1/7 minutes
18.
Pipe A can fill a tank in 8 hours and Pipe B can empty it in 6 hours. If both pipes are opened, in how many hours will the tank be emptied if it is initially full? —
24 hours
19.
A boat takes 3 hours to travel upstream a distance of 12 km. If the speed of the stream is 2 km/hr, what is the speed of the boat in still water? —
4 km/hr
20.
A boat travels downstream at 18 km/hr and upstream at 12 km/hr. What is the speed of the stream? —
3 km/hr
21.
A boat travels downstream at 22 km/hr and upstream at 18 km/hr. What is the speed of the stream? —
4 km/hr
22.
A boat can travel at 16 km/hr in still water. If it takes 4 hours to travel a certain distance downstream and 6 hours to travel the same distance upstream, what is the speed of the stream? —
3.2 km/hr
23.
A boat travels downstream at 20 km/hr and upstream at 16 km/hr. What is the speed of the stream? —
4 km/hr
24.
Two taps A and B can fill a tank in 12 minutes and 18 minutes respectively. Both taps are opened together. After how much time should tap B be closed so that the tank is filled in 10 minutes? —
4 minutes
25.
Pipe X can fill a tank in 10 hours. Pipe Y can empty it in 15 hours. If both pipes are opened simultaneously, in how many hours will the tank be filled? —
30 hours
26.
Pipe A can fill a tank in 15 hours. Pipe B can empty it in 10 hours. If both pipes are opened, in how many hours will the tank be emptied if it is initially full? —
30 hours
27.
A train passes a pole in 12 seconds and a platform 250 meters long in 22 seconds. What is the speed of the train? —
25 m/s
28.
Two pipes, P and Q, can fill a cistern in 30 minutes and 45 minutes respectively. Both pipes are opened together, but Pipe Q is closed 15 minutes before the cistern is filled. How long does it take for the cistern to be filled? —
30 minutes
29.
A person travels from city A to city B at 20 km/hr and returns from B to A at 30 km/hr. What is the average speed for the entire journey? —
24 km/hr
30.
A boat moves at 20 km/hr in still water. If the speed of the stream is 4 km/hr, what is the time taken to cover 96 km downstream? —
4 hours
31.
A boat's speed in still water is 18 km/hr. If the speed of the stream is 4 km/hr, what is the time taken to cover 88 km downstream? —
4 hours
32.
A boat moves upstream at a speed of 12 km/hr and downstream at a speed of 18 km/hr. What is the speed of the stream? —
5 km/hr
33.
Pipe A can fill a tank in 12 hours and Pipe B can empty it in 18 hours. If both pipes are opened, in how many hours will the tank be filled? —
36 hours
34.
A man walks at 4 km/hr and runs at 8 km/hr. How long will it take him to cover a distance of 1 km, if he walks for 30 minutes and then runs for the remaining distance? —
37.5 minutes
35.
A person travels from point A to point B at 30 km/hr and returns from B to A at 50 km/hr. What is the average speed for the entire journey? —
37.5 km/hr
36.
A man walks at 5 km/hr and runs at 10 km/hr. How long will it take him to cover a distance of 1 km, if he walks for 30 minutes and then runs for the remaining distance? —
36 minutes
37.
A boat's speed in still water is 12 km/hr. If the speed of the stream is 3 km/hr, what is the time taken by the boat to travel 60 km upstream? —
8 hours
38.
A boat moves at 15 km/hr in still water. If the speed of the stream is 5 km/hr, what is the time taken to cover 50 km upstream? —
5 hours
39.
A person walks from point A to point B at a speed of 4 km/hr and returns from B to A at a speed of 6 km/hr. What is the average speed for the entire journey? —
4.8 km/hr
40.
A person walks from point A to point B at 6 km/hr and returns from B to A at 4 km/hr. What is the average speed for the entire journey? —
4.8 km/hr
41.
A car travels from city X to city Y at 40 km/hr and returns at 60 km/hr. What is the average speed of the car for the entire journey? —
48 km/hr
42.
If Pipe A can fill a tank in 10 hours and Pipe B can fill the same tank in 15 hours, how long will it take for both pipes to fill the tank together? —
6 hours
43.
A boat's speed in still water is 10 km/hr. If the speed of the stream is 2 km/hr, what is the time taken by the boat to travel 72 km downstream? —
6 hours
44.
Two taps A and B can fill a tank in 20 minutes and 30 minutes respectively. Both taps are opened together. After how much time should tap B be closed so that the tank is filled in 15 minutes? —
9 minutes
45.
A train travels from city P to city Q at 50 km/hr and returns from Q to P at 75 km/hr. What is the average speed for the entire journey? —
60 km/hr
46.
Two pipes A and B can fill a tank in 3 hours and 4 hours respectively. A third pipe C can empty the tank in 6 hours. If all three pipes are opened together, how long will it take to fill the tank? —
6 hours
47.
A boat travels upstream for 3 hours and covers a distance of 18 km. It travels downstream for the same amount of time and covers a distance of 30 km. What is the speed of the boat in still water? —
8 km/hr
48.
A boat travels upstream for 4 hours and covers a distance of 24 km. It travels downstream for the same amount of time and covers a distance of 40 km. What is the speed of the boat in still water? —
8 km/hr
49.
Two pipes P and Q can fill a tank in 12 minutes and 15 minutes respectively. Both pipes are opened together, but Pipe P is closed 3 minutes before the tank is filled. How long does it take to fill the tank? —
8 minutes
50.
A car covers a distance of 360 km in 4 hours. If it covers the first 240 km in 3 hours, at what speed must it travel for the remaining distance to complete the journey in the scheduled time? —
80 km/hr