On the side of the road, there is a wooden pole every 40 meters (both ends), a total of 121, and now there are 51 concrete poles (including both ends), then the distance between two adjacent cement poles how many.
公路的一旁每隔40米有木电杆一根(两端都有)，共121根，现改为水泥电杆51根(包括两端)，那么两根相邻水泥电杆之间的距离是多少．
<gadget id="calculator">121 - 1</gadget>
<output>120</output>

<gadget id="calculator">51 - 1</gadget>
<output>50</output>

<gadget id="calculator">120 / 50</gadget>
<output>12/5 = around 2.4</output>

<gadget id="calculator">40 * (12/5)</gadget>
<output>96</output>

<result>96</result>