At 18 33, Tiffany started driving at 50 km/h from her home to a library 35 km away. She was at the library for 2 h 13 min.
- What time did she leave the library?
- After leaving the library, Tiffany drove back along the same route and took 42 min to reach home. What was her average speed, in km/h, for the journey home?