At 4:40, what is the angle formed by the minute hand and the hour hand on the clock face?
4时40分，钟面上分针与时针所组成的角是多少度．
<gadget id="calculator">40 / 60</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">30 * (2/3)</gadget>
<output>20</output>

<gadget id="calculator">30 - 20</gadget>
<output>10</output>

<gadget id="calculator">30 * 3</gadget>
<output>90</output>

<gadget id="calculator">10 + 90</gadget>
<output>100</output>

<result>100</result>