How many degrees does the hour hand rotate clockwise from "1" around the center of the clock face to "4".
时针从"1"绕钟面中心按顺时针方向旋转多少度到"4"．
<gadget id="calculator">360 / 12</gadget>
<output>30</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

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

<result>90</result>