SOLUTION: Chris drove 756 miles from his home to a town where his girlfriend lives. His speed was 72 mph except on a part of the highway under construction, where he had to slow down. If his

Question 32308: Chris drove 756 miles from his home to a town where his girlfriend lives. His speed was 72 mph except on a part of the highway under construction, where he had to slow down. If his total driving time was 12 hours and the part under construction was 324 miles, at what speed did he drive the part under construction in mph? Your answer is expected to be an integer. Put your answer in the answer box. Put the unit mph after your answer.
Answer by mukhopadhyay(490) (Show Source): You can put this solution on YOUR website!
Under Construction = 324 miles
Clear drive = 756-324 = 432 miles
Time taken on clear traffic was 432/72 = 6 hours
Time taken on construction areas was 12-6 = 6 hours
Speed on construction areas = 324/6 = 54 mph

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