A car travels from A to B at 40 km per hour and takes 6 hours to get there. If it takes 5 hours to arrive, how many kilometers per hour must be traveled? (Solve with ratio)
一辆汽车从甲地到乙地，每小时行40km，6小时可以到达．如果要5小时到达，每小时必须行驶多少km？(用比例解)
<gadget id="calculator">40 * 6</gadget>
<output>240</output>

<gadget id="calculator">240 / 5</gadget>
<output>48</output>

<result>48</result>