At 11 31, Irene started driving at 50 km/h from her home to a boutique 40 km away. She was at the boutique for 1 h 10 min.
- What time did she leave the boutique?
- After leaving the boutique, Irene 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?