Question

A 120m long train is moving in a direction with speed 20m/s. A train B moving with 30 m/s in the opposite direction and 130 m long crosses the first train in a time

• A. 6 s
• B. 36 s
• C. 38 s
• D. None of these

Answer 1

The correct option is D None of these

Total distance =130+120=250 m
relativity velocity =30-(-20)=50 m/s
hence t = $\frac{250}{50}$ =5s