Question

- Two cars leave from the same place at the same time and travel in opposite

direction. One car travels at 45 mph and the other at 55 mph. After how
many hours will there be 225 miles apart?

Answer 1

2.25 hours

Explanation:

The cars are driving away from each-other, beginning at the same time. They travel at a combined rate of 100 mph (45+55), therefore every hour they get 100 miles away from each other (provided the speeds remain constant). Divide this by the distance you want to solve for to get 225 / 100 = 2.25. This is of course in hours (like the question asks for), but if you wanted hours and minutes just multiply the decimal number by 60, so 2.25 hours, or 2 hrs 15 minutes.