Two cars, A and B, drive from A to B at the same time. When A travels 1/5 of the whole journey, B travels 50 kilometers. When A travels 4/5 of the whole journey, B leaves There are still 50 kilometers away from B. Find the distance in kilometers between A and B.
甲乙两车同时从A地开往B地，当甲车走全程的(1/5)时，乙车行了50千米，当甲车走到全程的(4/5)时，乙车离B地还有50千米．求AB两地相距多少千米．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">(4/5) / (1/5)</gadget>
<output>4</output>

<gadget id="calculator">50 * 4</gadget>
<output>200</output>

<gadget id="calculator">200 + 50</gadget>
<output>250</output>

<result>250</result>