SOLUTION: Billy made a trip to California and back. The trip there took four hours and the trip back took five hours. He averaged 5mi/h faster on the trip there than on the return trip. L

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Question 1048544: Billy made a trip to California and back. The trip there took four hours and the trip back took five hours. He averaged 5mi/h faster on the trip there than on the return trip. Let r represent his average speed on the return trip. What was Billy's average speed on both trip so?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
Distance the same both ways
D = rt
4(x+5) = 5x
4x + 20 = 5x
x = 20mph, speed back. Speed to = 25mph 20%2B5
AND
25*4 = 20*5 CHECKS!