Question

A and B can complete a job together in 30 days; B and C can complete the same job together in 25 days, while C and A can complete the same job together in 10 days. In how many days will A, B, and C be able to complete the same job alongside D, who is only 75% as efficient as C?

A 11(4/7)
B 7(17/19)
C 5(11/19)
D 4(11/17)
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