Question

A​ 150-pound person burns 5.1 calories per minute when walking at a speed of 4 miles per hour. While​ walking, this person eats a snack that has 60 calories. This snack subtracts from the calories burned while walking. How long must the person walk at this speed to burn at least 150 calories​? Use pencil and paper. Describe what values the person could change so that the amount of time spent walking would be less.

Answer 1

He needs to walk 41 mins or 2,76 miles to burn 150 calories.

If he increases the speed of walking or eats snack with less calories, he will spend less time for walking.

Explanation:

The person is burning

`5,1*60=306`

calories per hour.

He needs to burn 150 calories plus 60 calories that comes from the snack. In total 210 calories to burn.

`210/306=0,69`

He needs to walk 0,69 hours (aprrox. 41 mins) to burn 210 calories

`0,69*4=2,76`

In total he need to walk 2,76 miles to burn 210 calories.