Multiple choice

A train passes through a tunnel whose length is 500 metres in 1 minute while running at a speed of 72 km per hour. The length of the train is- एक रेलगाड़ी 500 मी. लम्बी सुरंग को 72 किमी/घंटा की चाल से 1 मिनट में पार करती है। रेलगाड़ी की लम्बाई है-

  1. 750 m./मी.

  2. 700 m./मी.

  3. 800 m./मी.

  4. 680 m./मी.
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B Correct answer
Explanation

Train speed = 72 km/h = 20 m/s. In 1 minute (60 seconds), distance covered = 20 × 60 = 1200 m. This distance equals tunnel length + train length. So train length = 1200 - 500 = 700 m. The train must completely exit the tunnel.

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