At 4 mph 6.6 calories are used in = 1 minute
So, at 4 mph, 240 calories are used in= [tex]\frac{1}{6.6}\times240[/tex]
= 36.36 minutes
Hence, a person must walk for 36.36 minutes to burn 240 calories.
To find the distance a person should walk, when the speed is 4 miles per hour.
In 60 minutes a person is walking = 4 miles
So, in 36.36 minutes a person will walk = [tex]\frac{4}{60}\times36.36[/tex]
= 2.424 miles
Hence, by walking 2.424 miles in 36.36 minutes a person can burn 240 calories,