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If speed of boat in still water is $10 k m / h r$ and the speed in downstream is $15 k m / h r$ , then the speed of current is

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$7.5 k m / h r$

$5 k m / h r$

$10 k m / h r$

$20 k m / h r$

answer is A.

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Detailed Solution

Given speed of boat in still water $=$ $10 k m / h r$

Let speed of stream $= x k m / h r$

Speed in down stream $= 15$

$\begin{array}{l} 10 + x = 15 \\ x = 15 - 10 \\ x = 5 k m / h r \end{array}$

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