A taxi and a minibus depart from Ningbo North Station and Cixi East Station at the same time, and meet at a distance of 4.5 kilometers from the midpoint. It is known that the speed of the minibus is that of a taxi (4/5) , Find the distance between Ningbo North Station and Cixi East Station.
一辆出租车和一辆中巴车分别从宁波北站和慈溪东站两地同时出发，在离中点4.5千米处相遇，已知中巴车速度是出租车速度的(4/5)，求宁波北站与慈溪东站的路程．
<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(5/9) - (4/9)</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">2 / (1/9)</gadget>
<output>18</output>

<gadget id="calculator">4.5 * 18</gadget>
<output>81</output>

<result>81</result>