<PRE><B>Question 916547</B>
A man travels a distance of 20 miles at 60 miles per hour and then returns over the same route at 40 miles per hour. What is his average rate for the round trip in miles per hour?
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Going DATA:
dist = 20 miles ; rate = 60 mph ; time = d/r = 20/60 = 1/3 hr
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Return DATA:
dist = 20 miles ; rate = 40 mph ; time = d/r = 20/40 = 1/2 hr
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Average rate = (total distance)/(total time)
AR = (20+20)/(1/3 + 1/2) = 40/(5/6) = 240/5 = 48 mph
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Cheers,
Stan H.
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