Question 315058
Joseph watch the roadside mile markers during a long car trip on an interstate highway. 
He notices that at 10:45 a.m. they are passing a marker labeled 101, and at 11:00
 a.m. the car reaches marker 119. What is the car's speed?
:
From the given information we can say, the car went 18 mi in 15 min
:
S = {{{60/15}}} * 18
S = 72 mph