At 10:30 on the clock face, what is the angle between the hour and minute hands?
钟面上10时30分，时针与分针所夹的角是多少度．
<gadget id="calculator">4 * 30</gadget>
<output>120</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * 30</gadget>
<output>15</output>

<gadget id="calculator">120 + 15</gadget>
<output>135</output>

<result>135</result>