Question

A​ 150-pound person uses 5.1 calories per minute when walking at a speed of 4 mph. How long must a person walk at this speed to use at least 180 ​calories?

A person must walk for at least
_____minutes in order to use at least 180 calories.
​(Round up to the nearest​ minute.)

Answer 1

Let 't' represent the time of the walk in minutes.

5.1*t = 220

t = 43.14 min

The person needs to walk at least 43.14 minutes to but at least 220 calories.