Two trains of length 110 m and 90 m are running on parallel lines in the same direction with a speed of 45 km/h and 50km/h respectively . In what time will they pass other ?

Two trains of length 140m and 100m long are going on a parallel track in same direction at a speed of 90 km/ph and 18 km/ph respectively. What is the time taken for the trains to cross each other completely?

Two trains, 230m and 270m long, are running on parallel tracks in the oppoite directions at a speed of 40km/h and 50 km/h, respectively. What is the time taken by the trains to cross each other completely?

Two trains are running on parallel lines in the same direction at a speed of 50 km. and 30 km per hour respectively. The faster train crosses a man in slower train in 18 seconds. The length of the faster train is: