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a 150 pund person uses 6.7 calories per minute when walking at a speed of 4 mph. How long must a person walk at this speed to use at least 210 calories?

User Mike Gwilt
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1 Answer

6 votes

EXPLANATION

Applying the unitary method we can get the distance as shown as follows:


\text{?miles}=210\text{ calories }\cdot\frac{\text{minute}}{6.7\text{ calories}}\cdot\frac{1\text{ hour}}{60\text{ minutes}}\cdot\frac{4\text{miles}}{1\text{hour}}

Multiplying terms:


=(140)/(67)\approx2.09\text{ miles}

Hence, a person should walk 2.09 miles to use at least 210 calories.

User Jcg
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