Detrmine the actual distance travelled by him in km.

If a surveyor walks at 14 kph rather that 10 kp, he would have walked 20 km more.Detrmine the actual distance travelled by him in km.
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The ratio of speeds is the ratio of the distances, because at the higher speed he can cover a greater distance. So x/(x+20)=10/14=5/7, 7x=5(x+20)=5x+100, and 2x=100 so x=50 km.

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