at 2 pm a freight train leaves a station and travels at 42 km/h. at 11pm and express train leaves the same station on a parallel track and travels at 105 km/h in the same direction. how far from the station will they meet?

Answer 1

since distance = speed 8 time, we want

42t = 105(t-9)
t = 15
So, at 5 am the next day they meet, after having gone 630km.

Or, you can consider that the freight train has a 9*42=378km head start, so the express train, traveling 63km faster, makes up the distance in 6 hours, after 630km.

Answer 2

how did you get 630km

Answer 3

multiply the speed by the time taken. The freight train traveled for 15 hours at 42 km/hr.