11. 

A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along the current in 10 minutes. How long will it take to go 5 km in stationary water?

A. 40 minutes
B.

1 घंटा

C.

1 घंटा 15 मिनट

D.

1 घंटा 30 मिनट


12. 

A man can row three-quarters of a kilometre against the stream in 11 minutes and down the stream in 7 minutes. The speed (in km/hr) of the man in still water is:

A. 2
B.

3

C.

4

D.

5


13. 

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:

A. 2 : 1
B.

3: 1

C.

3: 2

D.

4: 3


14. 

Speed of a boat in standing 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:

A. 16 hours
B.

18 घंटे

C.

20 घंटे

D.

चौबीस घंटे


15. 

A man rows to a place 48 km distant and come back in 14 hours. He finds that he can row 4 km with the stream in the same time as 3 km against the stream. The rate of the stream is:

A. 1 km/hr
B.

1.5 किमी / घंटा

C.

2 किमी / घंटा

D.

2.5 किमी / घंटा