A bus station sends out 5 vehicles in 20 minutes (the departure time is the same). According to this calculation, from 7:00 a.m. to 9:00 a.m., how many cars will be dispatched in total?
一个公交车站20分钟发出5辆车(发车间隔时间相同)．照这样计算，从上午7时开始到上午9时结束，一共要发出多少辆车？
<gadget id="calculator">9 - 7</gadget>
<output>2</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<gadget id="calculator">60 / 5</gadget>
<output>12</output>

<gadget id="calculator">2 * 12</gadget>
<output>24</output>

<gadget id="calculator">24 + 1</gadget>
<output>25</output>

<result>25</result>