On a section of the road, there are 121 cement poles every 40 meters. Later, 51 cement poles are used. What is the distance between the two cement poles?
一段公路上，每隔40米有一根水泥电线杆，共有121根，后来改用水泥电线杆51根，这时两根水泥电线杆的距离是多少米．
<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>