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 50% as efficient as C?

A 150/17
B 152/3
C 125/7
D 180/7
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