Two trains, A and B, travel from A to B and C respectively in opposite directions. It is known that the distance between A and B is (9/10) of the distance between A and C. When car A travels 60 kilometers, the ratio of the distance traveled by car B to the remaining distance is 1:3, and the distance between the two trains is equal to the destination. Find the distance between A and C.
甲、乙两列火车同时从A地向相反的方向行使，分别开往B地和C地．已知A、B之间的路程是A、C之间路程的(9/10)．当甲车行使60千米时，乙车行使的路程与剩下路程的比是1：3，这时两列火车离目的地的路程相等．求A、C两地之间的路程．
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 + 3</gadget>
<output>4</output>

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

<gadget id="calculator">(9/10) - (3/4)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">60 / (3/20)</gadget>
<output>400</output>

<result>400</result>