SOLUTION: mary drove 138 miles one way to visit her mother which took 2 1/2 hours.The return trip took 3 1/4 hours due to more traffic.what was her average speed for the entire trip?

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Question 806728: mary drove 138 miles one way to visit her mother which took 2 1/2 hours.The return trip took 3 1/4 hours due to more traffic.what was her average speed for the entire trip?
Found 2 solutions by solver91311, richwmiller:
Answer by solver91311(24713) About Me  (Show Source):
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Average speed is total distance divided by total time, so 2 times 138 divided by 2.5 plus 3.25

John

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Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
276/(2.5+3.25)=276/5.75 =48 mph average for trip
55.2 to
42.46 return