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A boat moves with a speed of 5 km/h relative to water in a river flowing with a speed of 3 km/h and having a width of 1 km. The minimum time taken around a round trip is

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5 min

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30 min

answer is D.

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Detailed Solution

$t = \frac{d}{v_{rel}} = \frac{1 km}{5 - 3} = 0.5 hr = 30 \min$

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