A boat moves with speed of 5 km/h relati...

A boat moves with 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

5 min

60 min

20 min

30 min

Text Solution

Verified by Experts

The correct Answer is:

For, shortest time, he should cross perpendicular to the river
Time to cross the river ` = (1km)/(4km// hr) = 0.25 hr`
Time taken round a trip = 0.5hr = 30 min

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