Question

a 150 - pound 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 150 calories? a person must walk for at least in order to use at least 150 calories. (round up to the nearest minute.)

Explanation:

Step1: Set up the equation

Let $t$ be the time in minutes. We know that the rate of calorie - burning is 6.7 calories per minute and the total number of calories to be burned is 150. So the equation is $6.7t\geq150$.

Step2: Solve for $t$

$t\geq\frac{150}{6.7}\approx22.39$.

Step3: Round up

Since we need to round up to the nearest minute, $t = 23$.

Answer:

23