At 3:30 on the clock face, what is the acute angle formed by the minute hand and the hour hand?
钟面上3时30分，分针和时针组成的锐角是多少．
<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">30 * 2</gadget>
<output>60</output>

<gadget id="calculator">15 + 60</gadget>
<output>75</output>

<result>75</result>