Boats and Streams

1.		A boat sails 15 km upstream in 5 hrs. How long will it take to cover the same distance downstream, if the speed of current is one-fourth the speed of the boat in still water

1.8 hrs

3 hrs

4 hrs

5 hrs

2.		A boat goes 24 km upstream and 28 km downstream in 6 hrs. If it goes 30 km upstream and 21 km downstream in 6 hrs and 30 mins, find the speed of the stream.

10 km/hr

5 km/hr

4 km/hr

6 km/hr

3.		A man can row at 5 kmph in still water. If the velocity of current is 1 kmph and it takes him 1 hour to row to a place and come back, how far is the place ?

2.4 km

2.5 km

3 km

3.6 km

4.		A boatman goes 2 km upstream in 1 hour and goes 1 km downstream in 10 minutes. How long will it take to go 5 km in still water ?

40 minutes

1 hour

1 hr 15 min

1 hr 30 min

5.		In one hour, a boat goes 11 km/hr along the stream and 5 km/hr against the stream. The speed of the boat in still water (in km/hr) is:

3 km/hr

5 km/hr

8 km/hr

9 km/hr

6.		Speed of a boat in still water is 9 kmph and the speed of the stream is 1.5 kmph. A man rows to a place at a distance of 105 km and comes back to the starting point. The total time taken by him is:

16 hours

18 hours

20 hours

24 hours

7.		A motorboat, whose speed in 15 km/hr in still water goes 30 km downstream and comes back in a total of 4 hours 30 minutes. The speed of the stream (in km/hr) is:

4

5

6

10

8.		The speed of a boat in still water is 15 km/hr and the rate of current is 3 km/hr. The distance travelled downstream in 12 minutes is:

1.2 km

1.8 km

2.4 km

3.6 km

9.		A boat takes 90 minutes less to travel 24 km downstream than to travel the same distance upstream. If the speed of the boat in still water is 12 km/h, the speed of the stream is:

4 km/h

5 km/h

6 km/h

Can't be determined

10.		A motorboat whose speed is 15 km/hr in still water goes 30 km downstream and comes back in 4 hrs and 30 mins. The speed of the stream is:

10 km/hr

4 km/hr

5 km/hr

6 km/hr