1.

A and B can do a piece of work in 48 days, A and C can do it in 60 days, b and c can do it 72 days. In what time can c alone do it?

Answer»

85 days 



(A+B) 1 day WORK = 1/48
(B+C) 1 day work = 1/72
(A+C) 1 day work = 1/60
By ADDING 2(A+B+C) = 1/48 +1/72+1/60 = 37/720
(A+B+C) 1 day work = 37/1440
A 1 day work = 37/1440 – 1/72 = 17/1440 = 85 days (approximately)



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