A scientist conducts an experiment. The start time of the experiment is recorded for the first time. After that, he makes a record every 5 hours. When he makes the 11th record, the hour hand points to exactly 9 o'clock. What time is the clock when the first record is made.
科学家进行一次实验，实验开始时间是为第一次记录，以后每5小时做一次记录，他做第11次记录时，时针正好指向9时整，则第一次记录时，时钟是多少时．
<gadget id="calculator">24 * 2</gadget>
<output>48</output>

<gadget id="calculator">11 - 1</gadget>
<output>10</output>

<gadget id="calculator">5 * 10</gadget>
<output>50</output>

<gadget id="calculator">9 - 50</gadget>
<output>-41</output>

<gadget id="calculator">48 + (-41)</gadget>
<output>7</output>

<result>7</result>