At 3:40, what is the angle between the hour and minute hands?
3点40分时，时针分针夹角是多少度．
<gadget id="calculator">60 - 40</gadget>
<output>20</output>

<gadget id="calculator">20 / 60</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">4 + (1/3)</gadget>
<output>13/3 = around 4.333333</output>

<gadget id="calculator">30 * (13/3)</gadget>
<output>130</output>

<result>130</result>