Two trains 140 m and 160 m long run at the speed of 60 km/hr and 40 km/hr respectively in opposite directions on parallel tracks. The time (in seconds) which they take to cross each other, is:

We are given:

• Length of Train A = 140 m
• Length of Train B = 160 m
• Speed of Train A = 60 km/h
• Speed of Train B = 40 km/h

Step 1: Find total distance to be covered
Total length = 140 + 160 = 300 meters

Step 2: Calculate relative speed
Relative Speed = 60 + 40 = 100 km/hConvert to m/s: 100 × (1000 / 3600) = 27.78 m/s

Step 3: Use time = distance / speed
Time = 300 / 27.78 ≈ 10.8 seconds

Final Answer:
The time taken to cross each other is 10.8 seconds