It takes 20 minutes to saw a steel bar into 5 sections, how many minutes will it take to saw it into 10 sections at the same speed?
把一根钢筋锯成5段，需要20分钟，如果用同样的速度把它锯成10段，需要多少分钟？
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">5 * 9</gadget>
<output>45</output>

<result>45</result>