- 1. Guess whether or not the two ditch diggers will meet.
- 2. If they don't meet, what is the closest you think they will come to each other?
- 3. What information would be useful to know here?
- 4. What information doesn't matter?
- 5. What is the closest they come to each other? On what day should they stop digging in their original direction and pick a new one?