Question: A is 50% as efficient as B. C does half of the work done by A and B together. If C alone does the work

A is 50% as efficient as B. C does half of the work done by A and B together. If C alone does the work in 40 days. Then A, B and C together can do the work in:

(a) 13⅓ days

(b) 15 days

(c) 20 days

(d) 30 days

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