An old man walks on the road at a constant speed, and it takes 22 minutes to walk from the first telegraph pole to the 12th telegraph pole. How many minutes will it take for the old man to walk to the 40th telegraph pole at the same speed?
一个老人匀速在公路上散步，从第1根电线杆走到第12根电线杆用了22分钟．这个老人用同样的速度走到第40根电线杆，共要走几分钟？
<gadget id="calculator">12 - 1</gadget>
<output>11</output>

<gadget id="calculator">22 / 11</gadget>
<output>2</output>

<gadget id="calculator">40 - 1</gadget>
<output>39</output>

<gadget id="calculator">2 * 39</gadget>
<output>78</output>

<result>78</result>