At 8 a.m., Archie started from City N and travelled towards City P and his speed remained constant throughout. At 10 a.m., Gillian started her journey from City N towards City P at an average speed of 72 km/h. Gillian overtook Archie at 2 p.m. After overtaking, Gillian carried on her journey at the same average speed and reached at City P at 5:15 p.m.
- Find Archie's average speed in km/h.
- What is the distance between the two cities?