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### Question

A man can row a boat at the rate of 14 km/h in still water, and at the rate of 4 km/h against the stream. At what rate can he row down the stream?

**A**

24 km/h.

**B**

25 km/h.

**C**

23 km/h.

**D**

27 km/h.

**Soln.**

**Ans: a**

If v is the speed of the stream, 14 - v = 4, so the speed of the stream is 14 - 4 = 10 km/h. So his downstream speed would be 14 + 10 = 24 km/h.