SOLUTION: If you walk for 1.5 hours at 3 mph, how fast should you run during the next 0.5 hours to have the average speed of 4 mph?

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Question 1019103: If you walk for 1.5 hours at 3 mph, how fast should you run during the next 0.5 hours to have the average speed of 4 mph?
Answer by jorel555(1290) About Me  (Show Source):
You can put this solution on YOUR website!
Total time=2 hours
2 hours @ 4 mph=8 miles
1.5@3 mph=4.5 miles
8-4.5=3.5 miles
3.5 miles in .5 hours equals 7 miles in 1 hr., or 7 mph necessary!!!!!!!