If it takes 2 minutes to saw a steel bar into two pieces, how many minutes will it take to saw it into 6 pieces?
把一根钢筋锯成两段需要2分钟，锯成6段需要多少分钟．
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<result>10</result>