a boat man goes 4 km against the current of the stream in 1hour and goes 2 km

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Question

a boat man goes 4 km against the current of the stream in 1hour and goes 2 km along the current in 5 minutes. how long will it take to go 21 km in stationary water?

Options:

A . 1 Hour

B . 1 Hour 15 Minutes

C . 1 Hour 30 Minutes

D . 1 Horr 45 Minutes

Answer: Option B
Explanation :

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