Car Fleet

class Solution:
    def carFleet(self, target: int, position: List[int], speed: List[int]) -> int:
        arr = sorted(zip(position, speed), reverse=True)
        arrive_times = [(target - p) / s for p, s in arr]

        answer = 0
        current_t = 0
        for t in arrive_times:
            if t > current_t:
                answer += 1
                current_t = t

        return answer