A train traveling at 48 km/hr crosses another train of half its length traveling in opposite direction at 42 km/hr in 12 seconds. The length of the first train is:

Two trains start from Delhi and Mumbai towards each other at 6 AM and 7 AM respectively. Their speeds are 60 km/hr and 80 km/hr respectively. The distance between Delhi and Mumbai is 1200 km. At what time will they meet?

A train crosses two persons walking in the same direction at 4.5 km/hr and 5.4 km/hr in 10 seconds and 11 seconds respectively. The length of the train is:

A train 500 m long is running at 72 km/hr. If it crosses a tunnel in 1 minute, what is the length of the tunnel?