Discussion of Question with ID = 039 under Boats-and-Streams

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The upstream journey of a boat takes 6 times the time it takes it to complete the downstream journey. What is the ratio of the speed of the boat in still water to the speed of the stream?









Ans: a

Let the distance be L and the speed of the boat in still water be u, with v being the speed of the stream. We are given $L/{u - v} = 6 × L/{u + v}$. We can solve this equation for u/v to get u/v = ${6 + 1}/{6 - 1}$ = $1{2/5}$.

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