Q. Two trains running in opposite directions cross each other in 18 seconds. Their speeds are 36 km/h and 54 km/h. What is their total length?
✅ Correct Answer: (B)
450 m
Explanation: Relative speed = (36+54)×5/18 = 25 m/s → Length = 25×18 = 450 m.
Explanation by: Hriday
Relative speed = (36+54)×5/18 = 25 m/s → Length = 25×18 = 450 m.