A car travels 80 kilometers per hour on average, and the gasoline it carries can be used for up to 6 hours. In the case of no refueling, in order to ensure the return to the starting point, the maximum number of kilometers should be driven back.
一辆汽车平均每小时行80千米，所带的汽油最多可用6小时，在不加油的情况下，为保证返回出发地，最多开出多少千米就应往回行驶．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">80 * 3</gadget>
<output>240</output>

<result>240</result>