An express train travelling at 80 km/hr overtakes a goodi trains, twice as long and going 40 km/hr on a parallel track in 54 seconds. How long will the express train take to cross station 400 m long

 A train travels from A to B at the rate of 20km/hr and from B to A at the rate of 30km/hr,find the average speed.

 Jagan went to another town covering 240km by car moving at 60km/hr. Then he covered 400km by train moving at 100km/hr and the rest 200km he covered by bus moving at 50km/hr.The average speed during the whole journey is:

Two trains are travelling in the same direction with speeds of 30km/hr and 58km/hr respectively.A man in the slower train passes the faster train in 18s.Find the length of the faster train.