At 15 33, Tammy started driving at 51 km/h from her home to a supermarket 34 km away. She was at the supermarket for 2 h 12 min.
- What time did she leave the supermarket?
- After leaving the supermarket, Tammy drove back along the same route and took 25 min to reach home. What was her average speed, in km/h, for the journey home?