A person weighing 170 lb burns 8.6 calories per minute while mowing a lawn. How many calories would be burned in 3 hr of mowing?

Question

How many calories would be burned in 3 hr of mowing?

Answer 1

The weight does not matter in this problem.  Just multiply the rate of burning calories by the duration of the time interval.

 

r = rate = 8.6 cal/min = 8.6 cal/[(1/60)hr] = 516 cal/hr

 

Cal consumed in 3 hours:

 

rt = (516 cal/hr)(3 hrs) = 1548 cal