Janet burns 15 calories per minute on the treadmill. How many calories does Janet burn per one-hour?
a. 300 calories / hour
b. 800 calories / hour
c. 900 calories / hour
d. 1100 calories / hour
Answer: c
Explanation:
The answer is 900 calories / hour
One hour = 60 minutes.
Therefore, in order to find out how many calories Janet burns in one hour, we multiply the amount of calories she burns per minute (in this case 15) by the total minutes per hour, which are 60 as follows:
(15 calories / 1 minute) x (60 minutes / 1 hour) = 900 calories / 1 hour
Note that the units for minutes disappear and we are left with calories per hour.
©Copyright 2007.Najwa S. Hirn. All rights reserved.
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