The following questions each present two quantities, Quantity I and Quantity
II. Compare the values of the two quantities and determine their relationship. A train P covers a 400 m platform in 15 seconds and crosses a tree in 9 seconds. Quantity I:  Determine the time required for Train Q, which has a length of 300 m, to cross a platform equal in length to Train P. The speed of Train Q is 54 km/h. Quantity II:  Determine the time required for Train M to pass a 300 m platform, given that Train M’s length is 200 m shorter than Train P, and its speed is 36 km/h.