At 11 49, Roshel started driving at 63 km/h from her home to a library 42 km away. She was at the library for 2 h 20 min.
- What time did she leave the library?
- After leaving the library, Roshel 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?