Question

Translate to a system of equations and solve.
Two cars leave town at the same time going in opposite directions.One car travels 50 mi/h and the other travels 55 mi/h.In how many hours will they be 420 miles apart?

Answer 1

55h + 50h = 420

105h = 420

h = 4

Answer 2

let in t hours it will happen . in t hours 1st car will go 50t and second will go 55t. so total distance=(55+50)t
hence 105t=420
t=4hrs