Answer the following questions based on the activity chart.
a. How many calories are burned during 4 hours of cross-country skiing?
b. Jane played tennis for 3 hours while Carolyn played volleyball for 4 hours. Who burned more calories, and how many more?
c. Lyle went snowshoeing for 4 hours and Maurice went cross-country skiing for 5 hours. Who burned more calories, and how many more?
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