Multiple choice

Two trains 137m and 163m in lengths are running towards each other on parallel lines, one at the rate of 42 km/h and another at 48 km/h. In what time will they be clear of each other from the moment they meet? दो ट्रैन जिनकी लम्बाई 137 मीटर और 163 मीटर है,समान्तर रेखा में विपरीत दिशा में चल रही है। यदि इनकी चाल 42किमी/घंटा और 48किमी/प्रति घंटा हो तब वह एक दूसरे को कितनी देर में पार करेंगी ?

  1. 10 sec

  2. 12 sec

  3. 14 sec

  4. 15 sec

  5. 16 sec
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B Correct answer
Explanation

Total distance to be covered = sum of train lengths = 137 + 163 = 300 m. Relative speed when moving towards each other = 42 + 48 = 90 km/hr = 90 × 5/18 = 25 m/s. Time = Distance/Speed = 300/25 = 12 seconds. The trains will be clear of each other in 12 seconds from the moment they meet.

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