Welcome to your interview.
The question is on your right: Routing Cluster Optimization. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
Given an array of delivery coordinates, write an optimal algorithm to group them into efficient routing clusters based on distance constraints.