obviously just divide 57 by 6 to get 1 mile and get the answer of x minutes per 1 mile which is 9.5 minutes, but here is the long way below
so 6 mils =57 minuste
so 1 mile=x minutes
6 to 57=1 to x
6/57=1/x
multiply both sides by x
6x/57=1
multiply both sides by 57
6x=57
divide both sides by 6
x=9.5
the answer is 9.5 minutes per 1 mile