A, B, and C have to travel from A to B. The distance between A and B is 42 kilometers. A rides a motorcycle and can only take one person at a time. The motorcycle travels 36 kilometers per hour, and the person walks every hour. To travel 4 kilometers per hour, if a combination of motorcycles and walking is used, three people start from point A at the same time and all arrive at point B. How long will it take at the fastest?
甲，乙，丙三人都要从A地到B地，A，B两地相距42千米，甲骑摩托车，一次只能带一个人，摩托车每小时行36千米，人步行每小时行4千米，如果采用摩托车和步行相结合的办法，三人同时从A地出发，全部到达B地，最快要多长时间？
<gadget id="calculator">14 / 5</gadget>
<output>14/5 = around 2.8</output>

<gadget id="calculator">16 / 5</gadget>
<output>16/5 = around 3.2</output>

<gadget id="calculator">36 + (16/5) + 4</gadget>
<output>216/5 = around 43.2</output>

<gadget id="calculator">42 / (216/5)</gadget>
<output>35/36 = around 0.972222</output>

<gadget id="calculator">(14/5) * (35/36)</gadget>
<output>49/18 = around 2.722222</output>

<result>49/18 = around 2.722222</result>