At 20 54, Xylia started driving at 54 km/h from her home to a library 45 km away. She was at the library for 1 h 12 min.
- What time did she leave the library?
- After leaving the library, Xylia drove back along the same route and took 27 min to reach home. What was her average speed, in km/h, for the journey home?