Two trains 100 m and 150 m long run in opposite directions at 36 km/h and 54 km/h. How many seconds do they take to cross each other completely?
Q1. Two trains 100 m and 150 m long run in opposite directions at 36 km/h and 54 km/h. How many seconds do they take to cross each other completely?
Answer: 10 seconds
Explanation: Relative speed is 36 plus 54, which is 90 km/h or 25 m/s. Combined length is 250 m, so crossing time is 250 divided by 25, giving 10 seconds.