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The speed of boat in still water 9 kmph and speed of stream is 3 kmph. Find the time taken by boat to cover 12 km upstream.

A2 hours

B3 hours

C4 hours

D5 hours

Answer:

A. 2 hours

Read Explanation:

Speed of stream is: 3kmhr Speed of boat in still water is: 9kmhr Speed of boat in downstream = 9 + 3 = 12 Speed of boat in upstream = 9 - 3 = 6 Time taken by boat in upstream: =12/6=2hr


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