# RE8 | x-ai/grok-4.3 | run 2

## Prompt

Minimize total time to finish these tasks, one at a time, respecting dependencies: A (2h, no deps); B (3h, needs A); C (1h, no deps); D (2h, needs B and C). Give a valid order and the total time.

## Response

The tasks execute sequentially with no parallelism allowed, so the minimum total time equals the sum of all durations. A valid order is A, C, B, D for a total of 8 hours.

## Task Details
- A: 2 hours, no dependencies
- B: 3 hours, requires A
- C: 1 hour, no dependencies
- D: 2 hours, requires B and C

## Valid Sequence
**A → C → B → D**  
A finishes first to unlock B. C slots in before D. B completes before D starts.

## Why This Minimizes Time
All valid sequences require the same 8 hours because execution is strictly one task at a time. No sequence can finish earlier without violating dependencies or the single-task rule.

What other scheduling constraints, such as deadlines, would you like to add?
