The courier goes to the logistics company to pick up the goods 6 times a day, the first time is at 7:00 am, and the last time is at 5:00 pm. If the time intervals of picking up the goods are the same, what is the fourth time to pick up the goods.
快递员每天到物流公司取6次货物，第一次是早晨7时，最后一次是下午5时．如果取货的时间间隔相同，那么第四次取货是多少时．
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">10 / 5</gadget>
<output>2</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">17 - 4</gadget>
<output>13</output>

<result>13</result>