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 ! )

- math -
**nancy**, Saturday, March 6, 2010 at 3:35pm
w=d/t

let x=80, so

(80+80)/(8hs+10hrs)

=8.8889 mi/hour

- math -
**PsyDAG**, Sunday, March 7, 2010 at 9:25am
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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