A, B and C can reap a field in 15 ¾ days; B, C and D in 14 days; C, D and A in 18 days; D, A and B in 21 days. In what time can A, B, C and D together reap it?
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Answer:
∴ A, B, C and D together can reap the field in = 1/(5/63) = 63/5 = 12 3/5 days
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