Sarah burns an average of 744 calories in 45 minutes while running. She ran at 10 miles per hour. There are 5,280 feet per a mile. How many calories did Sarah burn per foot? Round to the nearest tenthousandth.

Number of miles ran by Sarah in 1 hour or 60 minutes = 10 miles

Then

The number of miles ran by Sarah in 45 minutes = (10/60) * 45 miles

= (45/6) miles

= 15/2 miles

= 7.5 miles

Now we already get from the question certain important data. From those data we come to know

1 mile = 5280 feet

So

7.5 miles = (5280 * 7.5) feet

= 39600 feet

By running 39600 feet the amount of calories burnt by Sarah = 744 calories

So

By running 1 foot, the amount of calories burnt by Sarah = (744/39600) calories

= 0.019 calories

= 0.02 calories

So Sarah burns 0.02 calories per feet.