Ineed to know how to put the following word problem in an explicit formula to solve: i know the answer is 6 minutes but i'm struggling with how to represent it in an equation.

mississippi live streaming weather radio broadcast from noaa weather stations gives local weather updates every 18 minutes. the first update is at 2: 00 p. m. you turn the radio on at 5: 30 p. m. how long will you have to wait for the next local weather update?