A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km

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Question: A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along the current in 10 minutes. How long will it take to go 5 km in stationary water?

Options are:

A.     40 minutes
B.     1 hour
C.     1 hr 15 min
D.     1 hr 30 min

Correct answer is:

C.     1 hr 15 min