SOLUTION: An airforce plan made a trip to dublin and back the trip there took four hours and the trip back took seven hours. it averaged 165 mph faster on the trip there than on the return t

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Question 808759: An airforce plan made a trip to dublin and back the trip there took four hours and the trip back took seven hours. it averaged 165 mph faster on the trip there than on the return trip. Find the air force plane's average speed on the out bound trip.
Answer by TimothyLamb(4379) About Me  (Show Source):
You can put this solution on YOUR website!
D/f = 4
D/4 = f
D/r = 7
D/7 = r
f = r + 165
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D/4 = D/7 + 165
(7/28)D = (4/28)D + 165
(3/28)D = 165
D = 1540 miles
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Answer:
outbound = 1540/4 = 385 mph
inbound = 1540/7 = 220 mph
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