Fewpal
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A boatman goes 2 km against the current of the stream in 1 hr 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) 1 hr 30 mins

1 Answer

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Best answer

Correct option: c) 1 hr 15 mins

Explanation:

Rate downstream= (1/10)*60 = 6 km ph

Rate upstream= 2 km ph; speed in still water= 1/2*(6+2) =4 km ph

Required time = 5/4 hrs =1 hr 15 mins

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