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A river 2 km wide is flowing at the rate...

A river 2 km wide is flowing at the rate of 2km/hr. A boatman, can row the boat at a speed of 4 km/hr in still water, goes a distance of 2 km upstream and them comes back. The time taken by him to complete his journey is

A

60 minutes

B

70 minutes

C

80 minutes

D

90 minutes

Text Solution

Verified by Experts

The correct Answer is:
C
The velocity of upstream is (4-2) km/h and downstream is (4+2) km/h
`:.` Total time taken `=(2km)/(2km//h) + (2km)/(6km//h) =80` minutes
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