Question 575260
2 cars traveling at a constant speed- one at 60 mph and the other at 70 mph- start at the same time from the same point traveling in the same  direction. After how many hours will the distance between them be 40 mi
sol:
dist = speed * time 
so let time =x
70 * x - 60 * x = 40
solving for x you get 4 hours