KöMaL 2023 K774
A train is passing through a 300 meters long tunnel at a uniform speed. It takes 20 seconds, from the front of the train entering the tunnel to the rear end of the train emerging from the tunnel. A lamp hanging from the ceiling of the tunnel remains above the train for exactly 5 seconds. How long is the train?
Official text KöMaL. Quoted with source.
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