A person walks from the East Village to the West Village. After walking a long (2/5) distance, there is still (5/4) km away from the midpoint. How many kilometers is the road between the east and west villages?
一个人从东村步行到西村，走了路长的(2/5)后，离中点还有(5/4)km．东西两村之间路长多少千米？
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(1/2) - (2/5)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(5/4) / (1/10)</gadget>
<output>25/2 = around 12.5</output>

<result>25/2 = around 12.5</result>