Xiao Zhang, Xiao Wang and Xiao Li all want to go from A to B. At 6 o'clock in the morning, Xiao Zhang and Xiao Wang start from A at the same time. Xiao Zhang travels 5 kilometers per hour, and Xiao Wang travels 4 thousand kilometers per hour. rice. Xiao Li didn't start until 8:00 am, and at 6:00 pm, Xiao Zhang and Xiao Li arrived at B at the same time. When did Xiao Li catch up with Xiao Wang?
小张，小王和小李三人都要从甲地到乙地去，早上6时小张和小王同时从甲地出发，小张每小时行5千米，小王每小时行4千米．小李上午8时才出发，晚上6时，小张和小李同时到达乙地．问小李在何时追上小王的？
<gadget id="calculator">4 - 2</gadget>
<output>2</output>

<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">4 * 1</gadget>
<output>4</output>

<gadget id="calculator">8 + 4</gadget>
<output>12</output>

<result>12</result>