A motor boat moves at 14 km/h in still water, and the river current is 4 km/h. It goes 45 km downstream and comes straight back. How many hours does the whole trip take?

Question

Accepted Answer

7. Downstream speed = 18 km/h, upstream = 10 km/h. Time = 45/18 + 45/10 = 2.5 + 4.5 = 7 hours.

A motor boat moves at 14 km/h in still water, and the river current is 4 km/h. It goes 45 km downstream and comes straight back. How many hours does the whole trip take?

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