A and B can do a piece of work in 72 days. B and C in 120 days and Aand C in 90 days. in what time can A alone do it?
sonalkumarpathak8405:
ask it from A... xd
Answers
Answered by
1
A alone can do the same work in 42 days.
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3
Answer:
C) 120 days
Explanation:
(A + B)'s 1 day's work = 1 / 72
(B + C)'s 1 day's work = 1/120
(A + C)'s 1 day's work = 1 /90
2(A + B + C)'s 1 day's work =
1/72 + 1/120 + 1/90
(A + B + C)'s 1 day's work =
5+3+4/(360×2) = 12/ (360×2) = 1/60
As 1 day's work = (A + B + C)'s 1 day's work - (B + C)'s 1 day's work
= 1/60 - 1/120 = (2- 1)/120 = 1/120
A alone can finish the work in 120 days.
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