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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 190 calories?

Step-by-step explanation:

Let be "x" the time in minutes a 150-pound person must walk at  4 mph to use at least 190 calories.

 The amount of calories that a 150-pound person uses  in 1 minute when walking at a speed of 4 mph is:

Therefore, knowing this, we can write the following proportion:

Finally, we must solve for "x" in order to find its value.

Multiplying both sides of the equation by 190, we get this result:

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