A car and a bus leave from the same spot and drive in opposi

A car and a bus leave from the same spot and drive in opposite directions. The bus is travelling 15 miles per hour slower than the car. In 3.75 hours, the car and the bus are 144 miles apart. Find the average speed of the car.

d=rt
144=(x+x-15)3.75
144=(2x-15)3.75
144=7.5x-56.25
7.5x=144+56.25
7.5x=200.25
x=200.5/7.5
x=26.733 mph for the car.
26.733-15=11.733 mph for the bus.
Proof:
144=(26.733+11.733)3.75
144=38.466*3.75
144~144