10
Jul
A public relations expert made a trip to the city of Creston to conduct a lecture on dealing with bad press. The trip to Creston from his home took 2 hours. After having spent 4½ hours giving the lecture, he returned home using the same route except he had to drive 15 mph slower because of traffic congestion. If the expert was away from home a total of 9 hours, how fast did he drive both ways?
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