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A boat man goes 2 kms against the current of the stream in1 hour and goes 1 km along the current in 10 mins. How long will it take to go 5 km in stationary water?

A.	40 mins	B.	1 hr
C.	1 hr 15 mins	D.	50 mins

Answer and Explanation

Answer:1 hr 15 mins

Explanation:
Rate downstream = (1/10 * 60) kmph = 6 kmph, Rate Upstream = 2 kmph
Speed in still water = ½ (6 + 2) kmph = 4 kmph
Hence, Required time = 5/4 hrs = 1 ¼ hours = 1 hr 15 mins

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