SOLUTION: need to write an equation and solve Julia Ling drove the 200 km to Richmond at a speed 10 km/h faster than usual. If she completed the trip in one hour less than usual, find her

Question 1013784: need to write an equation and solve
Julia Ling drove the 200 km to Richmond at a speed 10 km/h faster than usual. If she completed the trip in one hour less than usual, find her usual driving speed.
Answer by ikleyn(52794) (Show Source): You can put this solution on YOUR website!
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Julia Ling drove the 200 km to Richmond at a speed 10 km/h faster than usual. If she completed the trip in one hour less than usual, find her usual driving speed.
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Your equation is

200/u - 200/(u+10) = 1.

where u is the usual speed in .

To solve it, multiply both sides by u*(u+1) to get off denominators.

Then simplify and solve.

Answer. 40 .

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