An average sixth grader burns 1.2 calories per minute studying. Kevin studied for 3 hours over the weekend. How many calories did her burn?

Question

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Answer 1

Multiply the rate of burning calories by the length of the time interval.  Work with compatible units.

 

rate = 1.2 cal/min = 1.2 cal/(1/60 hr) = 72 cal/hr

 

time = 3 hrs

 

calories = rate x time = (72 cal/hr)(3 hrs) = 216 cal