Asked by nana

A driver can travel 54 km at a constant speed. If he drives 3 km/h faster, he would have saved 3 km/h faster, he would have saved 3 hours. Let x be the speed of him originally, find the value of x.
Answered by Steve
since time = distance/speed, you know that

54/x - 3 = 54/(x+3)

Now just solve for x
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