It takes 72 seconds to saw a stick with a length of 80 cm into a stick with a length of 8 cm. How many seconds will it take to saw a stick with the same length into a stick with a length of 5 cm?
把一根长80cm的木棍全部锯成8cm的小棒，一共用了72秒，如果把同样长的木棍锯成长5cm的小棒，一共要用多少秒？
<gadget id="calculator">80 / 8</gadget>
<output>10</output>

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

<gadget id="calculator">72 / 9</gadget>
<output>8</output>

<gadget id="calculator">80 / 5</gadget>
<output>16</output>

<gadget id="calculator">16 - 1</gadget>
<output>15</output>

<gadget id="calculator">8 * 15</gadget>
<output>120</output>

<result>120</result>