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### Question

A man can row a boat at the rate of 12 km/h in still water, and at the rate of 6 km/h against the stream. At what rate can he row down the stream?

**A**

18 km/h.

**B**

19 km/h.

**C**

17 km/h.

**D**

21 km/h.

**Soln.**

**Ans: a**

If v is the speed of the stream, 12 - v = 6, so the speed of the stream is 12 - 6 = 6 km/h. So his downstream speed would be 12 + 6 = 18 km/h.