It took 1 hour and 20 minutes to saw a 4-meter-long cylindrical steel bar for 5 sections. How long would it take to saw this steel bar into 5 decimeter-long sections?
锯一条4米长的圆柱形钢条，锯5段用了1时20分，如果把这根的钢条锯成5分米长的小段，需要多长时间？
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

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

<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">4 / (1/2)</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>