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A man rows 25 km downstream and 20 km upstream taking 5 h each time . What is the velocity of the current ?

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A man rows 25 km downstream and 20 km upstream taking 5 h each time . What is the velocity of the current ?
A. 1 km/h
B. 2.5 km/h
C. 3.5 km/h
D. None of these
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Correct Answer - D
Speed downstream = `(25)/(5)` km/h = 5 km/h
Speed upstream = `(25)/(5)` km/h = 4 km/h
Velocity of the current = `(1)/(2) (5-4)` km/h = 0.5 km/h
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