Cyclist A and B cycled at an average speed of 15km/hr and 20km/hr respectively from the same starting point x on the same route.Cyclist B started his journey 6 min after Cyclist A started.(A part) What were the distances travelled by cyclists A and B 1 h after cyclist A started his journey from point x. (B part) Did cyclist B overtake cyclist A within the first hour of cyclist A's journey.