Two trains are running on parallel lines in the same direction at a speed of 50 km/hr and 30 km/hr respectively. The faster train crosses a man sitting in the slower in the slower in 18 seconds. What is the length of the faster train?

The relative speed of the faster train is= (50 - 30) km/hr

                                                       = 20 km/hr

                                                       = 20*1000/3600 m/s

Now,

The faster train travels in 1 second = 20*1000/3600 m

The faster train travels in 18 seconds= 20*18*1000/3600 m

               &nb