A and Bcan do work in 72 days. B and C in 120 days. A and C can do in 90 days.if A B and C work together how much work finished in 3 days
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Time taken by A and B = 72 days
Work done by A and B =1/72
Time taken by B and C = 120 days
Work done by B and C = 1/120
Time taken by C and A = 90 days
Work done by C and A = 1/90
Work done by A + B + B + C + C + A
Work done by 2A +2B +2C
= 2(1/72+1/120+1/90)
=2(5+4+3/360)
=2(12/360)
=2 × 1/30
= 2/30
= 1/15
Time taken by A + B + C = 15 days
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