Word problem

Question

a train leaves little rock Arkansas, and travels north at 55 kilometers per hour. Another train leaves at the same time and travels south at 65 kilometers per hourHow long will it take before they are 360 kilometers apart

Answer 1

The combined speed of the two trains is 120kph, and the distance is 360km.

Therefore, d = r t, 360km / 120kph = 3h

 

Proof: (55k/h x 3h) + (65kph x 3h) = 360; we get 165k + 195k = 360k