Question 1143297
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Ignore the following; I read the problem as having him go to work, back home, and then back to work again....<br>
30 minutes returning home means 60 minutes going to work.  So he drives 3*45 = 135 miles in 60+30+60 = 150 minutes, or 2.5 hours.  His average speed is 135/2.5 = 54 miles per hour.<br>
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The corrected solution has him driving 90 miles in 1.5 hours, an average of 90/1.5 = 60 miles per hour.