posted by Nancy on .
1) Two cars leave town at the same time going in opposite directions. One travels 44 mi/h and the other travels 55 mi/h. In how many hours will they be 297 miles apart?
2) Two cars leave town at the same time going the same direction on the same road. One travels 32 mi/h and the other travels 47 mi/h. In how many hours will they be 69 miles apart?
1) The distance between them increases at a rate of 99 mph. Divide 297 miles by that number.
2) In this case, the distance between them increaes at a rate of 15 mph. Divide 69 miles by that number.
But what are the equations for me to solve them?
I need equations, that's what the directions are telling me.
separation speed = 44 + 55 = 99
99 t = 297
in time t, fast one goes 47 t
slow one goes 32 t
47 t - 32 t = 69