Two trains are moving in opposite directions at 60 km/h and 90 km/h. How long will they take to cross each other if their lengths are 100m and 200m?
✓ Correct Answer: Option A
Relative speed = 150 km/h = 41.67 m/s. Total distance = 300m. Time = 300/41.67 ≈ 7.2 seconds.