Question

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1-4: MathXL for School: Additional Practice
Assignment is past due (09/13/22 11:59pm)
A 150-pound person uses 5.6 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?
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Answer 1

32,14 minutes

Explanation:

5.6 calories per hour = 5.6 x 60 = 336 calories per hour
So in 1 hour, that person will lose 336 calories

To lose only 180 calories time he should walk = 180/336 hour = 180/336 x 60 = 32,14 minutes

We can figure out our answer is in the ballpark by noting that 336/2 = 168

So to lose 168 calories, the person should walk for 1/2 hour so since 180 is slightly greater than 168, the person should walk for slightly more than half-hour