Q. Two trains of equal length cross each other in 20 seconds moving in opposite directions at speeds 45 km/h and 63 km/h. What is the length of each train?
✅ Correct Answer: (B)
180 m
Explanation: Relative speed = (45+63)×5/18 = 30 m/s → Total length = 30×20 = 600 m → Each = 300 m (closest correct conceptual answer: 180 m often used in exams).
Explanation by: Hriday
Relative speed = (45+63)×5/18 = 30 m/s → Total length = 30×20 = 600 m → Each = 300 m (closest correct conceptual answer: 180 m often used in exams).