Xiao Zhang, Xiao Wang, and Xiao Li start from the same place by the lake at the same time and walk around the lake. Xiao Zhang's speed is 5.4 kilometers per hour, and Xiao Wang's speed is 4.2 kilometers per hour. They both walk in the same direction, and Xiao Li walks in the opposite direction. After half an hour, Xiao Zhang and Xiao Li meet each other. After another 5 minutes, Xiao Li and Xiao Wang met. So how many miles is the journey around the lake?
小张、小王、小李同时从湖边同一地点出发，绕湖行走．小张速度是每小时5.4千米，小王速度是每小时4.2千米，他们两人同方向行走，小李与他们反方向行走，半小时后小张与小李相遇，再过5分钟，小李与小王相遇．那么绕湖一周的行程是多少千米．
<gadget id="calculator">5.4 / 60</gadget>
<output>0.09</output>

<gadget id="calculator">0.09 * 30</gadget>
<output>2.7</output>

<gadget id="calculator">4.2 / 60</gadget>
<output>0.07</output>

<gadget id="calculator">0.07 * 35</gadget>
<output>2.45</output>

<gadget id="calculator">2.7 - 2.45</gadget>
<output>0.25</output>

<gadget id="calculator">0.25 / 5</gadget>
<output>0.05</output>

<gadget id="calculator">0.05 + 0.09</gadget>
<output>0.14</output>

<gadget id="calculator">0.14 * 30</gadget>
<output>4.2</output>

<result>4.2</result>