Question 1143297: Anayet Is drive me to work from home and realizes he left his wallet at home when he is at his workplace. He turns back to retrieve his wallet. His work place And home are 45 miles apart and it takes him twice as long to get to work from his home than the other way around. It is a 30minute drive from his work place to home. What is the average speed for the round trip in miles?
Answer by greenestamps(13200)   (Show Source):
You can put this solution on YOUR website!
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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....
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.
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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.
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