SOLUTION: An ambulance drives to a hospital at 100mph and returns at 60 mph. What was the average speed for the round trip?

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Question 661676: An ambulance drives to a hospital at 100mph and returns at 60 mph. What was the average speed for the round trip?
Answer by Alan3354(69443) About Me  (Show Source):
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An ambulance drives to a hospital at 100mph and returns at 60 mph. What was the average speed for the round trip?
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= 2*100*60/(100 + 60)
= 75 mi/hr