# By how much percent must a motorist increase his speed in order to reduce the time by 20%, taken to cover a certain distance?

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by KULDEEPFM

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by KULDEEPFM

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if you have to take 20% less time,

20% of 1h = 0.2 h

So you will take = 1 - 0.2 = 0.8h

speed = 1km / 0.8h = 1.25 km/h

increase in speed = 1.25 - 1 = 0.25 km/h

% increase = (0.25/1) * 100 =

So you have to increase speed by 25%.