Multiple choice

Two trains are running at 40 km/hr. and 70 km/hr. respectively in the same direction. Fast train completely passes a man sitting in the slower train in 12 seconds. What is the length of the fast train? समान दिशाओ में चल रही दो ट्रेन जिनकी चाल क्रमशः 40 किमी/घंटे और 70 किमी/घंटा हैं । तेज गति वाली ट्रेन धीमी गति वाली ट्रेन में बैठे एक ब्यक्ति को 12 सेकेण्ड में पार करती है । तेज गति वाली ट्रेन की लम्बाई क्या है?

  1. 50 meter/मीटर

  2. 150 meter/मीटर

  3. 100 meter/मीटर

  4. 240 meter/मीटर
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C Correct answer
Explanation

When trains move in same direction, relative speed = 70 - 40 = 30 km/hr. Converting to m/s: 30 × (5/18) = 25/3 m/s. Distance covered in 12 seconds = (25/3) × 12 = 100 meters. This distance equals the length of the fast train.

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