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Real-Life Math

You don't need to be a math whiz to be a pro cyclist. But math can help you be a better racer.

For instance, racers use math to figure out their speed and their progress in training.

Charting your time on the same course on several different occasions is an excellent training tool, says Alison Dunlap. She is a professional road and mountain bike racer.

Seeing a lower time on the same course can mean several things, she says.

"It could show you are in better shape and your body is processing more oxygen. It could mean you are more powerful and stronger," she notes. "Or it could just mean you had a tailwind on one run."

Now, use your math skills to figure this out:

Cyclist Mike Carmichael finishes a 125-mile race in France in 9 hours and 45 minutes. Three months later, he finishes a race over the same course in 9 hours and 28 minutes.

What was his speed per hour in each of the races? How much faster was he traveling per hour in the second race?