exam Maths Puzzle

A boatman rows to a place 45 km distant and back in 20 hour. He finds that he can row 12 km with the stream in the same time as 4km against the stream. Find the speed of the stream.

A.

3 km/hr

B.

2.5 km/hr

C.

4 km/hr

D.

3.5 km/hr

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exam Other Question
Two identical trains A and B running in opposite direction at same speed tale 2 min to cross each other completely. The number of bogies of A are increased from 12 to 16. How much more time would they now require to cross each other?

A.

40 sec

B.

50 sec

C.

60 sec

D.

20 sec A motorboat whose speed is 15 km/hr in still water goes 30km downstream and comes back in four and a half hours. The speed of the stream is:

A.

4.5 km/hr

B.

6 km/hr

C.

7 km/hr

D.

5 km/hr