An express at 90 km/h and a goods train at 72 km/h head for each other on neighbouring tracks. At what rate, in m/s, does the distance between them shrink?

PhysicsEasyHigh School (11–12)Mechanics › Relative Motion

An express at $90\ \text{km/h}$ and a goods train at $72\ \text{km/h}$ head for each other on neighbouring tracks. At what rate, in m/s, does the distance between them shrink?

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