Abus and a car leave from the same city traveling in opposite directions. the bus leaves 2 hours before the car does. the bus travels at a steady speed of 50 mph while the car travels at 70 mph. after how many hours will the bus and car be 800 miles apart?

if h represents the number of hours the bus travels, then which of the following expressions represents the number of miles the car travels?

a.70(h + 2)
b.70(h - 2)
c.70h