The fast and slow cars leave oppositely from places A and B, and the fast car goes first for the whole (1/5) and 11 kilometers before the slow car leaves. When they met, the slow train traveled the whole distance (2/7). It is known that the speed ratio of the fast and slow cars is 5:4. How many kilometers are there between A and B?
快慢两车从甲乙两地相对开出，快车先行了全程的(1/5)又11千米后，慢车才开出．相遇时，慢车行了全程的(2/7)．已知快、慢两车速度比是5：4．甲乙两地相距多少千米？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 - (2/7)</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">(2/7) / 4</gadget>
<output>1/14 = around 0.071429</output>

<gadget id="calculator">(1/14) * 5</gadget>
<output>5/14 = around 0.357143</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(5/14) + (1/5)</gadget>
<output>39/70 = around 0.557143</output>

<gadget id="calculator">(5/7) - (39/70)</gadget>
<output>11/70 = around 0.157143</output>

<gadget id="calculator">11 / (11/70)</gadget>
<output>70</output>

<result>70</result>