At 20 52, Kimberly started driving at 81 km/h from her home to a supermarket 27 km away. She was at the supermarket for 1 h 29 min.
- What time did she leave the supermarket?
- After leaving the supermarket, Kimberly 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?