Answer: It would take 1 hour and 30 minutes for one people do it.
If 5 people do it would take less time. If there are 5 people delivering the letters it would take them 12 minutes ti deliver all 1,000 letters.
Use a ruler. I can't see the picture.
3 meters is the same thing as 12/4 meters so divide 12/4 by 3/4 to get 4.