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
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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
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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! .
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 .
