Question

Assume running consumes 103 calories per mile. If you run 9-minute mile, what is your average output in watts, during a 1-hour run?

Answer 1

9 minutes ⇒ 1 mile
1 hour = 60 minutes
60 minutes ⇒ 60/9 mile = 6.667 miles

1 mile ⇒ 103 cal
6.667 miles ⇒ 6.667(103) cal = 686.667 cal

1 cal ⇒ 4.184 joules
686.667 cal ⇒ 2873.0133 joules

Watts = joules/time in seconds
60 minutes = 3600 seconds
W = 2873.0133/3600 ≈ 0.79805925 (round as needed)