A car transports goods from place A to place B. The gas station is at (6/7) of the whole journey, and 18 kilometers away from the gas station at (1/4) of the journey back. How many miles is it from A to B?
一辆汽车从甲地到乙地运货，行至全程的(6/7)处是加油站，返回时行至全程的(1/4)的地方距加油站有18千米．甲地到乙地有多少千米？
<result>252</result>