SOLUTION: Two cars start together and head east, one averaging 42 mph and the other averaging 53 mph. In how many hours will the cars be 82.5 miles apart.

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Question 496417: Two cars start together and head east, one averaging 42 mph and the other averaging 53 mph. In how many hours will the cars be 82.5 miles apart.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Equation for the one going 42 mi/hr
(1) +d+=+42t+
Equation for the other car
(2) +d+%2B+82.5+=+53t+
(2) +d+=+53t+-+82.5+
--------------------
Since d is the same in both,
+42t+=+53t+-+82.5+
+11t+=+82.5+
+t+=+7.5+
They will be 82.5 mi apart in 7.5 hrs