Multiple choice

A train of length 700 m. passes through a tunnel whose length is 500 meters in 1 minute. The speed of the train is- एक 700 मी. लम्बी रेलगाड़ी 500 मी. लम्बी सुरंग को 1 मिनट में पार करती है। रेलगाड़ी की चाल है-

  1. 60 kmph/किमी./घंटा

  2. 64 kmph/किमी./घंटा

  3. 72 kmph/किमी./घंटा

  4. 75 kmph/किमी./घंटा
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C Correct answer
Explanation

Total distance to pass through tunnel = train length + tunnel length = 700 + 500 = 1200 meters. Time taken = 1 minute = 60 seconds. Speed = Distance/Time = 1200/60 = 20 m/s. Convert to kmph: 20 × (18/5) = 72 kmph. The train must travel its own length plus the tunnel length to completely clear the tunnel.

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