Domain: geography (Route Planning and Navigation)
Problem: Now Bob is going to start from the hotel, take his child John to the dentist, and then send John to the childcare center. However, after seeing the dentist, his mother Mary asked William to go to the place marked by the red arrow to get the childcare permit from Charles, and then go to the childcare center. How many extra kilometers does Bob have to walk because of this?
Answer: 0.7 miles