A travels 67 kilometers per day, and B travels 55 kilometers per day, from the East Village to the West Village at the same time, but after traveling 30 kilometers, A returns to the East Village and immediately rushes to the West Village, if both of them arrive at the West Village at the same time. So, how many kilometers is the distance between the East and West villages?
甲每天行67千米，乙每天行55千米，同时由东村往西村，但甲行30千米后因故返回东村后立即赶往西村，如果两人同时到达西村．那么，东西两村相距多少千米．
<gadget id="calculator">2 / 67</gadget>
<output>2/67 = around 0.029851</output>

<gadget id="calculator">30 * (2/67)</gadget>
<output>60/67 = around 0.895522</output>

<gadget id="calculator">1 / 55</gadget>
<output>1/55 = around 0.018182</output>

<gadget id="calculator">1 / 67</gadget>
<output>1/67 = around 0.014925</output>

<gadget id="calculator">(1/55) - (1/67)</gadget>
<output>12/3_685 = around 0.003256</output>

<gadget id="calculator">(60/67) / (12/3_685)</gadget>
<output>275</output>

<result>275</result>