The speed of two trains are in the ratio of 3:4. They are going in opposite directions along parallel tracks. If each takes 3 seconds to cross a telegraph post, find the time taken by the trains to cross each other completely?

A train of length 200 m crosses a platform of which is 50 m more than train in 18 sec. Find the speed of train. 

Ravi travels 300 km. partly by train and partly by car. He takes 4 hr. to reach, if he travels 60 km. by train and rest by car. He will take 10 minutes more if he were to travel 100 km. by train and rest by car. the speed of the train is:

A train 150 m. long is running with a speed of 68 km. /hr. In what time will it pass a man who is running at 8 km. /hr. in the same direction in which the train is going?

A passenger train covers the distance between stations A and B, 50 minutes faster than a goods train. Find this distance between A and B if the average speed of the passenger train is 60 km/h and that of goods train is 20 km/h?

A train crosses a platform in 30 seconds travelling with a speed of 60 km / h. If the length of the train be 200 metres, then the length ( in metres ) of the platform is 

A train passes a 100 meters long platform in 28 seconds and a man standing on the platform in 20 seconds. The speed of the train is: