There is a piece of wood with a length of 2 meters. If it is sawed into short pieces with a length of 4 decimeters, it will take 24 minutes; if it is sawed into short pieces with a length of 5 decimeters, how many minutes will it take?
有一根长2米的木料，如锯成每段长为4分米的短木料，需要24分钟；如果把它锯成每段长5分米的短木料，需要多少分钟．
<gadget id="calculator">10 / 4</gadget>
<output>5/2 = around 2.5</output>

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

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

<gadget id="calculator">24 / 4</gadget>
<output>6</output>

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

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

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

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<result>18</result>