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

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$10 k m p h$

$7.5 k m p h$

$20 k m p h$

$5 k m p h$

answer is B.

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Detailed Solution

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

Speed of boat in down stream $= 15 k m p h$

$∴$ speed of current(stream) = speed of boat down stream – speed of boat is still water

$= 15 - 10$

$∴$ speed of current $= 5 k m p h$

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