ship sails from A to B, travels 20 kilometers per hour, and arrives in 10 hours; when returning, travels 25 kilometers per hour, how many hours can it return to A?
一艘轮船，从甲驶往乙，每小时行驶20千米，10小时到达；回来时，每小时行驶25千米，几小时可以回到甲？
<gadget id="calculator">10 / 25</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">20 * (2/5)</gadget>
<output>8</output>

<result>8</result>