# math

posted by
**anonymous**
.

two airplanes left the same airport traveling in opposite direction. if one airplane averages 400 miles per hour and the other airplane averages 250 miles per hour, in how many hours will the distance between the two planes be 1625 miles?

Does it help to point out that if they're going different directions, you can figure that each hour, they'll be another 650 miles apart?

Matt