Substitute to Find the Value of the Expression $d$ Miles Is $\frac { d } { 685 }$

Substitute to find the value of the expression.
-A plane flies at 685 miles per hour. The time, in hours, for the plane to travel a distance of $d$ miles is $\frac { d } { 685 }$ . How long will it take for the plane to travel 8220 miles?

A) $12 \mathrm { hr }$
B) $0.08 \mathrm { hr }$
C) $15 \mathrm { hr }$
D) $5,630,700 \mathrm { hr }$