car travels 220 km in 4 hours. If you drive at this speed for another 8 hours, how many kilometers have you traveled in total? (Solution by proportional method)
一辆汽车4小时行驶220千米．照这样的速度再行驶8小时，共行驶了多少千米？(用比例方法解)
<gadget id="calculator">220 / 4</gadget>
<output>55</output>

<gadget id="calculator">55 * 8</gadget>
<output>440</output>

<gadget id="calculator">440 + 220</gadget>
<output>660</output>

<result>660</result>