What is the downstream speed of a boat when the speed of the boat in still water is 10 m/s and the speed of the river is 20% of the speed of the boat?

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What is the downstream speed of a boat when the speed of the boat in still water is 10 m/s and the speed of the river is 20% of the speed of the boat?

A8 m/s

B12 m/s

C4 m/s

D9 m/s

Answer:

B. 12 m/s

Read Explanation:

The speed of the boat in still water = 10 m/s The speed of the river = 20% of 10 m/s = 2 m/s ⇒ Downstream speed = (10 + 2) = 12 m/s

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