Aptitude  Boats and Streams  Practice Q&A

1. A boat moves downstream at the rate of one km in 5 minutes and upstream at the rate of 4 km an hour. What is the velocity of the current?

4 km/hr 2 km/hr 3 km/hr 1 km/hr

2. A boat running downstream covers a distance of 16 km in 2 hours while for covering the same distance upstream, it takes 4 hours. What is the speed of the boat in still water?

4 km/hr 6 km/hr 8 km/hr Data inadequate

3. A boat takes 90 minutes less to travel 36 miles downstream than to travel the same distance upstream. If the speed of the boat in still water is 10 mph, the speed of the stream is:

2 mph 2.5 mph 3 mph 4 mph

4. A cistern is filled by pipe A in 8 hrs and the full cistern can be leaked out by an exhaust pipe B in 12 hrs. If both the pipes are opened in what time the cistern is full?

12 hrs 24 hrs 16 hrs 32 hrs

5. The current of a stream runs at the rate of 2 km per hr. A motor boat goes 10 km upstream and back again to the starting point in 55 min. Find the speed of the motor boat in still water?

22 km/hr 12 km/hr 20 km/hr 16 km/hr

6. A boat covers a certain distance downstream in 1 hour, while it comes back in 1$ \dfrac{1}{2} $ hours. If the speed of the stream be 3 kmph, what is the speed of the boat in still water?

12 kmph 13 kmph 14 kmph 15 kmph

7. A man takes twice as long to row a distance against the stream as to row the same distance in favour of the stream. The ratio of the speed of the boat in still water and the stream is:

2 : 1 3 : 1 3 : 2 4 : 3

8. Two pipes A and B can fill a tank in 10 hrs and 40 hrs respectively. If both the pipes are opened simultaneously, how much time will be taken to fill the tank?

8 hours 6 hours 4 hours 2 hours

9. A boat can travel with a speed of 12 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.

4 hr 4.25 hr 4.5 hr 6 hr

10. A boat covers a certain distance downstream in 4 hours but takes 6 hours to return upstream to the starting point. If the speed of the stream be 3 km/hr, find the speed of the boat in still water

15 km/hr 12 km/hr 13 km/hr 14 km/hr

 

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