A150 pound person uses 6.6 calories per minute when walking at a speed of 4 mph. how long must the person walk at this speed to use at least 240 calories

The person must walk 36.36 minutes to use at least 240 calories.

Step-by-step explanation:

Given:

A 150 pound person uses 6.6 calories per minute when walking at a speed of 4 mph.

Now, to find the time the person walk at this speed to use at least 240 calories.

As, given calories used per minute = 6.6.

So, to solve we use unitary method:

If 6.6 calories used in = 1 minute.

So, 1 calorie used in =

Thus, 240 calorie used in =

=

=

=

Therefore, the person must walk 36.36 minutes to use at least 240 calories.

the solution is 12x-6y