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

Question 736501: 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

Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
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
:
Let a = average speed for the whole trip, total distance/total time.
The round trip = 2(138) = 276 mi
total time for the trip: 2.5 + 3.25 = 5.75 hrs
:
a =
a = 48 mph

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