At 17 39, Vanessa started driving at 54 km/h from her home to a hypermart 45 km away. She was at the hypermart for 1 h 10 min.
- What time did she leave the hypermart?
- After leaving the hypermart, Vanessa 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?