The distance between A and B is 140 kilometers. It is known that the walking speed of a person is 10 kilometers per hour, and the speed of a motorcycle is 70 kilometers per hour. The back seat of the motorcycle can only carry one person. When three people are equipped with a How many hours does it take a motorcycle to travel from A to B?
甲、乙两地相距140千米，已知人的步行速度是每小时10千米，摩托车的速度是每小时70千米，摩托车的后座只可以带一个人，当三人并配备一辆摩托车从甲地到乙地至少需要多少小时？
<gadget id="calculator">140 / 8.75</gadget>
<output>16</output>

<gadget id="calculator">16 * 7</gadget>
<output>112</output>

<gadget id="calculator">7 - 1</gadget>
<output>6</output>

<gadget id="calculator">1 + 7</gadget>
<output>8</output>

<gadget id="calculator">6 / 8</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) * 7</gadget>
<output>21/4 = around 5.25</output>

<gadget id="calculator">16 * (21/4)</gadget>
<output>84</output>

<gadget id="calculator">112 + 84 + 112</gadget>
<output>308</output>

<gadget id="calculator">308 / 70</gadget>
<output>22/5 = around 4.4</output>

<result>22/5 = around 4.4</result>