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The speed of a boat in still water is 20 kmph, and the speed of the stream is 2 kmph. In how many hours would the boat cover a distance of 198 km downstream?

A11 hours

B6 hours

C9 hours

D15 hours

Answer:

C. 9 hours

Read Explanation:

Downstream speed = Speed of boat + Speed of stream Downstream speed = 20 + 2 = 22 km/h Required time = 198/22 = 9 Hr


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