Two cars, big and small, drive from A and B oppositely. The big car is still 1/8 of the way from B in 6 hours, and the small car has passed the midpoint of 54 kilometers. It is known that the large car is faster than the small car per hour. Fast 15 kilometers, how many kilometers are the distance between A and B?
大小两辆汽车分别从A，B两地相对开出，6小时大车离B地还有全程的(1/8)，小车已经过了中点54千米，已知大车比小车每小时快15千米，A，B两地相距多少千米．
<gadget id="calculator">15 * 6</gadget>
<output>90</output>

<gadget id="calculator">54 + 90</gadget>
<output>144</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/8) - (1/2)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">144 / (3/8)</gadget>
<output>384</output>

<result>384</result>