The distance between A and B is 240 kilometers. When they go there, they arrive in 8 hours. When they return, they travel an extra 10 kilometers per hour. How long will they arrive?
甲、乙两地相距240千米，去时8小时到达，返回时，每小时多行10千米，几小时到达？
<gadget id="calculator">240 / 8</gadget>
<output>30</output>

<gadget id="calculator">30 + 10</gadget>
<output>40</output>

<gadget id="calculator">240 / 40</gadget>
<output>6</output>

<result>6</result>