Question

a 150 - pound person uses 6.1 calories per minute when walking at a speed of 4 mph. how long must a person walk at this speed to use at least 160 calories? a person must walk for at least (round up to the nearest minute.) in order to use at least 160 calories.

Explanation:

Step1: Set up the equation

Let $t$ be the time in minutes. The rate of calorie - burning is 6.1 calories per minute. We want to use at least 160 calories, so the equation is $6.1t\geq160$.

Step2: Solve for $t$

Divide both sides of the inequality by 6.1: $t\geq\frac{160}{6.1}\approx26.23$.

Step3: Round up

Since we need to round up to the nearest minute, $t = 27$.

Answer:

27