Two people, A and B, start from two places AB and walk toward each other. Their speed ratio at the start was 4:3. After the first encounter, A's speed increased by 10%. B's speed is reduced by 20%. In this way, when A arrives at B, B is still 52km away from A. So how far is the distance between AB and AB?
甲乙二人分别从AB两地出发，相向而行．出发时他们的速度比是4：3，第一次相遇后，甲的速度提高了10%．乙的速度减少了20%．这样当甲到达B地时，乙离A地还有52km．那么AB两地相距多少km？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">6 / 11</gadget>
<output>6/11 = around 0.545455</output>

<gadget id="calculator">(3/7) * (6/11)</gadget>
<output>18/77 = around 0.233766</output>

<gadget id="calculator">(4/7) - (18/77)</gadget>
<output>26/77 = around 0.337662</output>

<gadget id="calculator">52 / (26/77)</gadget>
<output>154</output>

<result>154</result>