After the monsoon, a river's speed rises from 2 km/h to 4 km/h. For a launch that moves at 12 km/h in still water, by what percentage does the time for a fixed upstream run increase?

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Accepted Answer

25%. Upstream speed falls from 10 to 8 km/h. Time is inverse to speed: 10/8 = 1.25, i.e. 25% more time. (20% is the drop in speed.)

After the monsoon, a river's speed rises from 2 km/h to 4 km/h. For a launch that moves at 12 km/h in still water, by what percentage does the time for a fixed upstream run increase?

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