Imagine waiting in line to buy tickets for a sporting event. The ticket agent takes, on average, $30$ seconds to sell a ticket. The game starts at $5$:$30$ p$.$m$.$ You have heard from your friends that the line is usually longon average, $60$ people. Which of the following is the latest that you can arrive to get in line to make sure you have your ticket before the $5$:$30$ game start time?