Question

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?

Answer 1

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:

$=\frac{140}{67}\approx2.09\text{ miles}$

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