At 5:40, what is the angle formed by the hour hand and the minute hand?
5时40分时，时针与分针所成的角是多少度．
<gadget id="calculator">3 * 30</gadget>
<output>90</output>

<gadget id="calculator">0.5 * 40</gadget>
<output>20</output>

<gadget id="calculator">90 - 20</gadget>
<output>70</output>

<result>70</result>