On the clock face, at 6:45, what is the angle between the hour and minute hands?
钟面上，6时45分，时针与分针的夹角是多少度．
<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>