A 270 metres long train running at the speed of 120 kmph crosses another train running in opposite direction at the speed of 80 kmph in 9 seconds. What is the length of the other train?

Given Data

• Train A length = 270 m; speed = 120 km/hr
• Train B speed = 80 km/hr; length = ?
• Opposite directions; crossing time = 9 s

Step 1: Relative speedv_rel = 120 + 80 = 200 km/hr = 200 × (5/18) = 55.5556 m/s

Step 2: Distance = speed × time(270 + L) = 55.5556 × 9 = 500 ⇒ L = 230 m

Final AnswerOther train's length is 230 m.