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posted by thommini on Saturday, March 6, 2010 at 3:31pm.

A cyclist bikes x distance at 10 miles per hour and returns over the same path at 8 miles per hour. What is the cyclist's average rate for the round trip in miles per hour? ( please help me ! )

w=d/t let x=80, so (80+80)/(8hs+10hrs) =8.8889 mi/hour

I don't know why nancy picked 80 as a value for x, since it could be almost any value. Since the distance is the same for both rates, it the mean of 10 and 8. (10 + 8)/2 = 9

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