So 50 miles/60 minutes and you basically just convert it
you want to divided by 10 so you will get
5miles/6minutes
and then multiply both by 3 and you will get 18
so it takes 18 minutes
The algebraic expression would be 4 - n, I believe.
The reciprocal is the flipped value so it will be11/9
27.928cm² the process is shown in the following picture