Boats and Streams

1.		A boat covers a certain distance downstream in 1 hour, while it comes back upstream in 1 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

2.		A boat is rowed down a river 40 km in 5 hr and up a river 21 km in 7 hr. Find the speed of the boat and the river.

61/12 kmph

4.5 kmph

5 kmph

5.5 kmph

3.		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

4.		A person can row with the stream at 8 km/hr and against the stream at 6 km/hr. The speed of the current is:

1 km/hr

2 km/hr

4 km/hr

5 km/hr

5.		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

6.		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

7.		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

8.		A man takes twice as long to row up the stream as to row down the stream. The ratio of the speed of the boat (in still water) to the stream is:

2 : 1

3 : 1

3 : 2

3 : 5

9.		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

10.		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