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OpenStudy (anonymous):
Jon recently drove to visit his parents who live 120 miles away. His average speed on the way there was 9 miles per hour faster than on his way home. If Jon spent a total of 6 hours driving find the speed on his way there and on the way back.
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OpenStudy (anonymous):
rt = d, so t=d/r Time one way was 9 mph faster than the other so you solve 120/r + 120/(r+9) = 6
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