10. A train takes 5 seconds to pass an electric pole. If the length of the train is 120 metres, the time taken by it to cross a railway platform 180 metres long, is:

11. A train 120 metres long is running at a rate of 54 kim/hr Time taken by the train to cross a tunnel 130 metres long is:

12. A train 100 metres in length passes a milestone in 10 seconds and another train of the same length travelling in opposite direction in 8 seconds. The speed of the second train is: