Answer the question based on the information given. The distance between 'C' and 'D' is 19 miles. A cyclist starts out from 'C' at a constant speed in the direction of 'D'. A motor car leaves- 'C' 15 minutes later in the same direction. In 10 minutes, it catches up with the cyclist and continues on to 'D', after reaching 'D' it turns around and in 50 minutes after leaving 'C' encounters the cyclist second time. The speed of the cycle is: