If one runs nine miles, one will consume 9*109=981 calories per minute
We need to transform that into Watts (Joules per second), as shown below.
[tex]\begin{gathered} 1\text{calorie}=4.184\text{Joules} \\ 1\text{ minute=60seconds} \end{gathered}[/tex]Therefore,
[tex]981\frac{\text{cal}}{\min}=\frac{981\cdot4.184}{60}\frac{J}{s}=68.4084W[/tex]The answer is 68.4084Watts
