SOLUTION: Denise drove to her parents' house at a rate of 70 mph. She came back by the same route, but drove at a rate of 80 mph. If the round trip took no more than 3 hours, what is the gre
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Question 813149: Denise drove to her parents' house at a rate of 70 mph. She came back by the same route, but drove at a rate of 80 mph. If the round trip took no more than 3 hours, what is the greatest possible distance she could have traveled to her parents?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
a+b<=3,
70a=80b
a = 8/5, b = 7/5
112 miles maximum
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