On the clock face, when the hour hand goes from "2" to "5", how many hours have passed, and the hour hand has passed ((())/(())) on the clock face.
钟面上，时针从"2"走到"5"时，经过了多少小时，时针走过钟面的((())/(()))．
<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<result>3</result>