Problems on Trains - General Questions

A train running at 54 km/hr crosses a pole in 10 seconds. What is the length of the train?

How many seconds will a train 250 m long running at 72 km/hr take to cross a bridge 250 m long?

How many seconds will a train 150 m long running at 72 km/hr take to cross a bridge 150 m long?

Two trains 100 m and 140 m long are running in opposite directions on parallel tracks at 54 km/hr and 18 km/hr. In how much time will they cross each other completely?

A train 270 m long passes a man running at 5 km/hr in the same direction in 18 seconds. What is the speed of the train?