If Anshul rows 15 km upstream and 21 km downstream taking 3 hours each time, then the speed of the stream is:

1 km/hr

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1.5 km/hr

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2 km/hr

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12 km/hr

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Solution

The correct option is A 1 km/hr
Rate upstream
$= (\frac{15}{3}) k m p h = 5 k m p h$

Rate downstream
$= (\frac{21}{3}) k m p h = 7 k m p h$

$∴$ Speed of stream
$= \frac{1}{2} (7 - 5) k m p h$
= 1 kmph

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