Multiple choice

A train 125 m. in length, moves at a speed of 82 km/hr. In what time the train will cross a boy who is walking at 8 km./hr. in opposite direction? एक 125 मी. लम्बी ट्रेन, 82 किमी./घं. की चाल से चल रही है, तो कितने समय में 8 किमी./घं. की चाल से विपरित दिशा से आ रहे लड़के को पार करेगी?

  1. 8 sec. / से.

  2. 9 sec. / से.

  3. 5 sec. / से.

  4. 6 sec. / से.
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C Correct answer
Explanation

Train speed = 82 km/hr, boy speed = 8 km/hr opposite direction. Relative speed = 82 + 8 = 90 km/hr = 90×(5/18) = 25 m/s. Time to cross = length/relative speed = 125/25 = 5 seconds.

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