A car leaves every 5 minutes from the starting point of the bus station. When the ninth car leaves, how many minutes have passed in total?
公交车站起点站每隔5分钟开出一辆汽车，当开出第9辆车时，一共经过了多少分钟．
<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<gadget id="calculator">5 * 8</gadget>
<output>40</output>

<result>40</result>