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

1 km/h

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2.5 km/h

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3.5 km/h

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4.5 km/h

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None of these

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Solution

The correct option is E None of these
Speed downstream $= \frac{25}{5} k m / h = 5 k m / h$
Speed upstream $= \frac{25}{5} k m / h = 4 k m / h$
Velocity of the current $= \frac{1}{2} (5 - 4) k m / h = 0.5 k m / h$

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