Two cars leave st. louis at the same time and travel south on the same interstate. one car travels at a constant speed of 58 miles per hour and the other travels at a constant speed of 63 miles per hour. in how many hours will the cars be 40 miles apart?
d=rt
distance car one = 58 time
distance car two = 63 time
you are being asked the distance between the two
d2- d1 = t(63-58) = 5t = 40
divide both side by 5 and your answer is 8 hours.
