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### Question

A boat has a speed of 5 km/h in a still stream. What is the speed downstream in a stream that is flowing at a speed of 2 km/h?

**A**

7 kmph.

**B**

8 kmph.

**C**

6 kmph.

**D**

10 kmph.

**Soln.**

**Ans: a**

The downstream speed is the speed along the direction of the flow of the stream. It is equal to the sum of the speed of the boat in still water and the speed of the stream. So the speed downstream is 5 + 2 = 7 km/h.