A man rows down a river 15 km in 3 hrs with the stream and back in 28 2 hrs The rate at which he row...........

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A man rows down a river 15 km in 3 hrs with the stream and back in 28/2 hrs The rate at which he rows in still water is

2.5 km/hr

1.5 km/hr

3.5 km/hr

4.5 km/hr

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Explanation:

x = 1/s (man’s rate with current + his rate against current)
Given,
x is the man's rate in still water
Distance = 15 km
Man's rate with current = 15/3 = 5 km/h
Man's rate against current = 15 / 15/2 = 2km/hr
By the short trick approach, we get
x = 1/2 (5 + 2)
= 7/2 = 3.5 km/hr