Posted by **Kerri** on Friday, May 25, 2007 at 12:56am.

If a person cross-country skis for 35 minutes, how many calories will be burned?

700 calories are burned in 1 hour.

I do not know how to set it up?

set up a ratio

cal/35 = 700/60

cross-multiply and solve for 'cal'

you should get appr. 408

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