It takes 1 hour and 20 minutes to saw a 4-meter-long cylindrical steel bar and saw 5 sections. If such a steel bar is sawed into half-meter-long small sections, how many minutes will it take?
锯一条4米长的圆柱形的钢条，锯5段耗时1小时20分钟，如果把这样的钢条锯成半米长的小段，需要多少分钟？
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">80 / 4</gadget>
<output>20</output>

<gadget id="calculator">4 / 0.5</gadget>
<output>8</output>

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

<gadget id="calculator">20 * 7</gadget>
<output>140</output>

<result>140</result>