At 6:45 on the clock face, what degree is the hour hand behind the minute hand?
钟面上6时45分，时针在分针后面多少度．
<gadget id="calculator">9 - 6</gadget>
<output>3</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">45 / 60</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">5 * (3/4)</gadget>
<output>15/4 = around 3.75</output>

<gadget id="calculator">15 - (15/4)</gadget>
<output>45/4 = around 11.25</output>

<gadget id="calculator">6 * (45/4)</gadget>
<output>135/2 = around 67.5</output>

<result>135/2 = around 67.5</result>