Multiple choice

A train 150 m long is running at a speed of 90 kmph. Time taken by the train to cross a tree is

  1. 3 sec

  2. 4 sec

  3. 6 sec

  4. 8 sec
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C Correct answer
Explanation

Convert speed from kmph to m/s: 90 * (5/18) = 25 m/s. Time = Distance / Speed = 150 / 25 = 6 seconds.

AI explanation

To cross a stationary pole, the train must cover a distance equal to its own length. Using the conversion factor, a speed of 90 kmph equals 90 multiplied by (5/18), which gives 25 m/s. The time taken to cross the tree is calculated as Distance divided by Speed, yielding 150 divided by 25. The required time is 6 sec.

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