At 16 36, Pamela started driving at 55 km/h from her home to a supermarket 33 km away. She was at the supermarket for 1 h 31 min.
- What time did she leave the supermarket?
- After leaving the supermarket, Pamela drove back along the same route and took 33 min to reach home. What was her average speed, in km/h, for the journey home?