Xiao Zhang and Xiao Li are cleaning a road, Xiao Zhang is responsible for the left side, and Xiao Li is responsible for the right side. Xiao Zhang’s cleaning speed is (4/3) times that of Xiao Li. Later, Xiao Li spends 10 minutes changing tools After that, Xiao Li's speed is twice as fast as before. From the beginning, after 1 hour, two people complete the task at the same time. How many minutes did Xiao Li work after changing tools?
小张和小李二人清扫一条马路，小张负责左边，小李负责右边，小张清扫的速度是小李的(4/3)倍，后来，小李用10分钟去换工具，换工具后小李的速度是原来的2倍．从开始起，经过1小时两人同时完成任务．小李换工具后又工作了多少分钟．
<gadget id="calculator">60 * 4</gadget>
<output>240</output>

<gadget id="calculator">240 - 150</gadget>
<output>90</output>

<gadget id="calculator">90 / 3</gadget>
<output>30</output>

<result>30</result>