From A to B, a car travels 50 kilometers per hour and can reach it in 6 hours. If you travel 10 kilometers per hour, how many hours can you arrive in advance? (Solve with ratio)
从甲地到乙地，一车汽车每小时行50千米，6小时可以到达．如果每小时多行10千米，可以提前几小时到达？(用比例解)
<gadget id="calculator">50 * 6</gadget>
<output>300</output>

<gadget id="calculator">10 * 6</gadget>
<output>60</output>

<gadget id="calculator">60 - 300</gadget>
<output>-240</output>

<gadget id="calculator">300 + (-240)</gadget>
<output>60</output>

<gadget id="calculator">50 + 10</gadget>
<output>60</output>

<gadget id="calculator">60 / 60</gadget>
<output>1</output>

<result>1</result>