Multiple choice

A train crosses a pole in 15 sec. and a 100 m. long platform in 25 sec. The length of the train is -

  1. $125 m.$
  2. $130 m.$
  3. $150 m.$
  4. $175 m.$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When a train crosses a pole, it covers its own length. When it crosses a 100m platform, it covers its length plus 100m. Speed = Length/15 = (Length+100)/25. Solving: 25×Length = 15×(Length+100), so 10L = 1500, L = 150m. The train's length is 150 meters.

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