Two identical steel bars, one of which was sawed into 3 sections took 12 minutes, and the other was sawn into 6 sections, how many minutes would it take?
两根同样的钢筋，其中一根锯成3段用了12分钟，另一根要锯成6段，需要多少分钟．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<result>30</result>