At 3:30, what is the angle formed by the hour hand and the minute hand on the clock face?
3：30时，钟面上时针与分针所成的角是多少度．
<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>