4. Mom asked Xiaoming to boil water and make tea for the guests. It takes 1 minute to clean the kettle, 15 minutes to boil water, 1 minute to clean the teapot, 1 minute to clean the teacup, and 2 minutes to get the tea leaves. Xiaoming estimated that it would take 20 minutes to complete these tasks. To make the guests drink tea as soon as possible, in what you think is the most reasonable arrangement, how many minutes can the tea be made?
4.【Solution】In this problem, the most reasonable arrangement should save the most time. First, wash the kettle, then boil the water. After the water is on to boil, Xiao Ming needs to wait 15 minutes. During this time, he can wash the teapot, wash the teacup, and get the tea leaves. Once the water boils, he can brew the tea. This way, it only takes 16 minutes.