选择题
2022 AMC 8 Problem 22: Bus and Zia
A bus takes 2 minutes to drive from one stop to the next, and waits 1 minute at each stop to let passengers board. Zia takes 5 minutes to walk from one bus stop to the next. As Zia reaches a bus stop, if the bus is at the previous stop or has already left the previous stop, then she will wait for the bus. Otherwise she will start walking toward the next stop. Suppose the bus and Zia start at the same time toward the library, with the bus 3 stops behind. After how many minutes will Zia board the bus?
2022 AMC 8 第 22 题：巴士和 Zia
公交车从一站到下一站需要 2 分钟，并在每个站等待 1 分钟让乘客上车。 Zia 从一个巴士站步行到下一站需要 5 分钟。当Zia到达公交车站时，如果公交车在前一站或者已经离开前一站，那么她就会等待公交车。否则她就会开始走向下一站。假设巴士和 Zia 同时出发前往图书馆，巴士落后 3 站。 Zia 需要多少分钟才能上车
A.
17
B.
19
C.
20
D.
21
E.
23