Multiple choice

There are two trains of same lengths one take 20 seconds and 30 seconds respectively to cross a telegraph post. Trains are travelling in opposite direction if the length of each train be 150 metres.In what time (in seconds) will they cross each other?

  1. 30 sec.

  2. 24 sec.

  3. 40 sec.

  4. 20 sec.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The first train's speed is 150/20 = 7.5 m/s, and the second's is 150/30 = 5 m/s. When traveling in opposite directions, their relative speed is the sum: 7.5 + 5 = 12.5 m/s. To cross each other, they must cover the total distance of both trains (150 + 150 = 300m). Time = distance/speed = 300/12.5 = 24 seconds.

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