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1. एक किलोमीटर लम्बी ट्रेन 1 किमी / घण्टा की रफ्तार से 1 किमी . लम्बी सुरंग को कितनी देर में पार करेगी ?

A A. 1 घंटा

B B. 1.5 घंटा

C C. 2 घंटा

D D. 2.5 घंटा

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