SOLUTION: A car went 4 miles up a hill at 10 miles per hour and back down the same hill 20 miles per hour. What was the average speed for the round trip?

SOLUTION: A car went 4 miles up a hill at 10 miles per hour and back down the same hill 20 miles per hour. What was the average speed for the round trip?

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Question 162810: A car went 4 miles up a hill at 10 miles per hour and back down the same hill 20 miles per hour. What was the average speed for the round trip?
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
D=RT OR D/R=T
4/10+4/20=.4+.2=.6 IS THE TIME FOR THE TOTAL TRIP.
8/.6=13.33 MPH IS THE AVERAGE SPEED.
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