Discussion of Question with ID = 080 under Boats-and-Streams

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Question

Two similar boats, A and B, start to move towards each other. If they meet when A has travelled $(1/6)$th of the distance, what is the ratio of the upstream speed to the downstream speed of a boat in that river?

A

5.

B

6.

C

4.

D

7.

Soln.
Ans: a

The boats are same, so they have the same speed in still water. Let the upstream speed be u and v be the downstream speed, and let the initial distance between them be L. When they meet they have travelled for the same time. So $(L/6)/u = ({5L}/6)/v$. The ratio $v/u$ = 5.


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