On a long (1/5) kilometer road, 5 street lamps (both ends are installed) are installed equidistantly. Calculate the distance between every two street lamps in meters.
在一段长(1/5)千米路上，等距离地安装了5盏路灯(两端都装)，算一算，每两盏路灯之间的距离是多少米．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">1_000 / 4</gadget>
<output>250</output>

<gadget id="calculator">(1/5) * 250</gadget>
<output>50</output>

<result>50</result>