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

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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 he take to go 5km in stationery water?

Options:

A . 40 Minutes

B . 1 Hour

C . 1 hr 15 Min

D . 1 Hr 30 Min

Answer: Option C
SPEED UPSTREAM = 2KM/HR.
SPEED DOWNSTREAM = 6 KM/HR
SPEED IN STATIONARY WATER = ½ (6 + 2) KM/HR = 4 KM/HR
TIME IS TAKEN TO COVER 5 KM IN STATIONARY WATER
= (1/4 X 5) 1 HR 15 MIN

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