SOLUTION: a car travels at a constant 84 mph in one direction then comes back covering the same distance at a constant 63 mph, what is the average speed?

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Question 581228: a car travels at a constant 84 mph in one direction then comes back covering the same distance at a constant 63 mph, what is the average speed?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
a car travels at a constant 84 mph in one direction then comes back covering the same distance at a constant 63 mph, what is the average speed?
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Avg = 2*84*63/(84+63) = 72 mi/hr