Two babies are born in a moving train, one in the compartment adjacent to the engine and other in the compartment adjacent to the guard.

Monjur Alahi

Two babies are born in a moving train, one in the compartment adjacent to the engine and other in the compartment adjacent to the guard. According to the train frame, the babies are born at the same instant of time. Who is elder according to the ground frame ?


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Salim Ahmed Kawsar

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The clocks of a moving frame are out of synchronization. The clock at the rear end leads the one at from by L0 V/C2 where L0 is the rest separation between the clocks, and v is speed of the moving frame. Thus, the baby adjacent to the guard cell is elder.

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