bicycle travels 45 kilometers in 3 hours. According to this calculation, how many hours does it take to travel 180 kilometers? What is the correct formula?
自行车3小时行驶45千米，照这样计算，行180千米需要多少小时，正确的算式是多少
<gadget id="calculator">45 / 3</gadget>
<output>15</output>

<gadget id="calculator">180 / 15</gadget>
<output>12</output>

<result>12</result>