30辆小车和3辆卡车一次运货75吨，45辆小车和6辆卡车一次运货120吨。每辆卡车和每辆小车每次各运货分别(S(F+b9d4v+X2l1g:I吨、3o(L,I,Q:G:?/B4b吨。0G/l5Z5|.{6]7y3m8a-Y.|