There is a wire, it takes (1/40) hour to cut it into 2 sections, how many minutes is needed to cut it into 5 sections.
有一根电线，把它截成2段，需要(1/40)小时，如果要截成5段，需要多少分．
<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">1.5 / 1</gadget>
<output>1.5</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">1.5 * 4</gadget>
<output>6</output>

<result>6</result>