Try This If You Are Bored Waiting For The Train

Algebra Level 4

Shina and Belle are standing together at the Riga Station waiting for a train. To make the wait less boring, they decide to play when a freight train drives towards the station (at constant speed). Once the engine of the freight train reaches the point where they are standing, Shina starts to walk in the same direction of the train, and Belle walks in the opposite direction, both at the same speed. They stop the moment when the last wagon passes by them.

Given that Shina walked 45 meters and Belle walked 30 meters, how long is the train (in meters)?

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