Distance travelled by freight train in 2 hour = 2 × 40 = 80 km . Relative speed = 60 km – 40 km = 20 km/hr Hence, time taken by express train to meet Freight train =
80‌km
20‌km∕hr
=4‌hr. So, Distance travelled = 4 × 60 or 6 × 40 = 240 km.