At 16 51, Xuan started driving at 70 km/h from her home to a bakery 28 km away. She was at the bakery for 2 h 21 min.
- What time did she leave the bakery?
- After leaving the bakery, Xuan drove back along the same route and took 30 min to reach home. What was her average speed, in km/h, for the journey home?