Question

A train leaves Little Rock, Arkansas, and travels North at 60 kilometers per hour. Another train leaves at the same time and travels South at 65 kilometers per hour. how many hours will it take before they are 250 kilometers apart?

Answer 1

After "t" seconds they will be

65*t + 60*t seconds apart, therefore we are looking for a "t" such that

65*t + 60*t = 250

125*t = 250

so t=2