HCU MCA 2015 Paper

A non-stop express train starts from Eastpur to Westnagar, travelling at 40 km per hour. At the same time another non-stop train starts from Westnagar to Eastpur but travelling at 45 km per hour. We cannot locate Eastpur and Westnagar on the map so we cannot say the distance between them. If we assume a distance between them greater than 200 kms, how far apart will they be exactly one hour before they cross each other ?