1. The problem is to organize a Rubik's Cube competition involving 6 classes within 40 minutes. 2. To manage time efficiently, divide the total time by the number of classes: $$\frac{40}{6} \approx 6.67$$ minutes per class. 3. Important rules: - Each class gets approximately 6 minutes and 40 seconds. - Allow a few minutes for setup and transition between classes. 4. Plan the schedule: - Allocate 6 minutes per class for the competition. - Reserve about 4 minutes total for transitions and instructions. 5. Summary: - Total time: 40 minutes - Number of classes: 6 - Time per class: about 6 minutes 40 seconds - Transition time: about 4 minutes This ensures all classes participate fairly within the 40-minute limit.