At 10 48, Yen started driving at 72 km/h from her home to a bistro 36 km away. She was at the bistro for 1 h 28 min.
- What time did she leave the bistro?
- After leaving the bistro, Yen drove back along the same route and took 20 min to reach home. What was her average speed, in km/h, for the journey home?