Multiple choice

Two trains are running in the same direction at 50km/hr. and 30km/hr. The faster train crosses a man sitting in the slower train in 18 seconds. Find the length of the faster train?

  1. $120m$
  2. $125m$
  3. $105m$

  4. Can't be determined

  5. None of these
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Relative speed of faster train w.r.t. slower train = 50 - 30 = 20 km/hr. Convert to m/s: 20 × (1000/3600) = 20 × (5/18) = 100/18 ≈ 5.56 m/s. Time = 18 seconds. Length = Speed × Time = (100/18) × 18 = 100 meters. Since 100m is not in the given options (120, 125, 105), the answer is 'None of these'. Option E is correct.

Keep practicing — related questions