At 9 a.m., John was cycling from Point A to Point B. At the same time, Mary was cycling from Point B to Point A, using the same route as John. Cycling at 4km/hr faster than Mary, John would pass Mary 300m away from the midpoint.
(a) What time did they pass each other?
(b) If John took another 3 mins to reach Point B, what time would Mary reach Point A?
Thank you for your help.