Solve the Problem $= \frac { \mathrm { d } } { \mathrm { r } }$

Multiple Choice

Solve the problem.
-The time it takes to travel a given distance at constant speed is given by the formula t $= \frac { \mathrm { d } } { \mathrm { r } }$ where t is the time, d is the distance, and r is the rate of travel. At 60 miles per hour, what distance can be traveled in 4 hours?

A) 120 mi
B) 240 mi
C) 480 mi
D) 48 mi