There are a batch of trucks going from A to B, which is α kilometers away, and then return to A. The gasoline carried by the trucks can only travel (2/3) α kilometers. The same) to ensure oil supply. An oil truck can transport a truck driving 40a dry meters of gasoline at a time. If the oil truck can store gasoline at any location on the road for backup, how many trucks can one oil truck guarantee to complete the task at the same time?
有一批卡车要从A地到相距α千米的B地，然后再返回A地，卡车自身携带的汽油只能走(2/3)α千米，有一台运油车(耗油量与卡车相同)保证供油．运油车一次能运送一辆卡车行驶40a干米的汽油．如果运油车可以把汽油存在路途中的任一位置备用，那么一辆运油车最多可以保证多少辆卡车同时完成任务？
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