average rate problem?

I can’t believe the answer given in the back of this book. This should be so easy.

Just to make it simple, let’s say x is 40 miles. It doesn’t actually matter what x is, the answer will be the same. So I picked a convenient value.

So at 10 mph, it will take 4 hours and at 8 mph, it will take 5 hours. So the 80 mile round trip took 9 hours. The average rate of speed is 80/9 = 8.9 mph, approximately.

Sam Whittingham 53.918 mph World Hour Bicycle Record

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