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【简答题】
某镇道路改造工程，由甲、工程队合作20天可完成，甲工程队单独施工比乙工程队单独施工多用30天完成此项工程。 （1）、工程队单独完成此项工程各需要多少天？ （2）若甲工程队独做a天后，再由甲、工程队合作_______天（用含a的代数式表示）可完成此项工程； （3）如果甲工程队施工每天需付施工费1万元，乙工程队施工每天需付施工费2.5万元，甲工程队至少要单独施工多少天后，再由甲、工程队合作施工完成剩下的工程，使施工费不超过64万元？
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