Two ships, A and B, set off from places A and B respectively. Ship A travels the whole distance (4/5), and ship B travels the whole distance (3/4). At this time, the distance between the two ships is 99 kilometers. How many kilometers are there between A and B?
甲、乙两船分别从A、B两地相对开出，甲船行了全程的(4/5)，乙船行了全程的(3/4)，这时两船相距99千米．A、B两地相距多少千米？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) - 1</gadget>
<output>-1/4 = around -0.25</output>

<gadget id="calculator">(4/5) + (-1/4)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">99 / (11/20)</gadget>
<output>180</output>

<result>180</result>