Multiple choice

Two trains, 125 metres and 115 metres in length, are running towards each other on parallel lines, one at the rate of 33 km/hr. and the other at 39 km/hr. How much time (in second) will they take to pass each other from the moment they meet? दो ट्रेनें 125 मी और 115 मी. लम्बाई की एक दूसरे की तरफ समान्तर चल रही है, एक 33 किमी/घं. और दूसरी 39 किमी/घंटा से। कितने समय में वे एक दूसरे को पार करेंगी?

  1. 8

  2. 10

  3. 12

  4. 15
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When trains move towards each other, their relative speed is the sum: 33 + 39 = 72 km/hr = 72 × (5/18) = 20 m/s. Total distance to cross = 125 + 115 = 240 m. Time = distance / speed = 240 / 20 = 12 seconds. This uses the concept of relative motion in opposite directions.

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