It takes a woodworker 40 minutes to saw a 4-meter-long cylindrical wood into 80-centimeter pieces; how long does it take to saw it into 50-centimeter pieces?
某木工把一根长4米的圆柱形木料锯成80厘米的小段，需40分钟；如果改锯成50厘米的小段，需要多少时间？
<gadget id="calculator">100 / 80</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">4 * (5/4)</gadget>
<output>5</output>

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

<gadget id="calculator">40 / 4</gadget>
<output>10</output>

<gadget id="calculator">100 / 50</gadget>
<output>2</output>

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">10 * 7</gadget>
<output>70</output>

<result>70</result>