Multiple choice

A person sitting on train and counts 21 poles in a minute. If distance between each pole is 50m, then what is the speed of the train. ट्रेन में बैठा एक आदमी एक मिनट में 21 टेलीफोन के खम्बे गिन सकता है। यदि ये खम्बे 50 मीटर की दूरी पर है, तो ट्रेन की चाल क्या होगी ?

  1. 55 km/hour 55 किमी./घण्टा

  2. 57 km/hour 57 किमी./घण्टा

  3. 63 km/hour 63 किमी./घण्टा

  4. 60 km/hour 60 किमी./घण्टा

  5. None of these इनमें से कोई नही
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

If 21 poles are counted in 1 minute, the train passes 20 gaps between poles (since counting starts at the first pole). Distance covered = 20×50m = 1000m in 60 seconds. Speed = 1000/60 = 16.67 m/s = 16.67×18/5 = 60 km/h. Option D (60 km/h) is correct.

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