A truck drives from point A to point B at a speed of 70km/h. After 4.5 hours, the ratio of the distance traveled to the distance traveled is 3:7. It will take several hours for the truck to reach point B.
一辆卡车从A地驶往B地，行驶速度为70km/h，行了4.5h后，已行的和未行的路程比是3：7，卡车要到达B地还需要几个小时．
<gadget id="calculator">7 / 3</gadget>
<output>7/3 = around 2.333333</output>

<gadget id="calculator">4.5 * (7/3)</gadget>
<output>10.5</output>

<result>10.5</result>