Algebra
posted by Lora on .
Two cars start at the same point at Alexandria, verginia, and travel 2
opposite directions. One car travels 5 miles per hour faster than the
other car. After 4 hours, the two cars are 420 miles apart. Find the
speed of each car.

V1 = = X mi/h
V2 = (x+5) mi/h.
d = 4*X + 4*(X+5) = 420
4x + 4x+20 = 420
8x = 42020 = 400
X = 50 mi/h.
X+5 = 55 mi/h.