Solution:
One day work of P and Q = 1/30
One day work of Q and R = 1/24
One day work of R and P = 1/20
One day work of P, Q and R = 1/2 (1/30+ 1/24+ 1/20)
= 1/2 ((4+5+6)/120)
= 1/2 (15/120)
= 1/2 (1/8)
=1/16
Therefore, P, Q and R can complete the work together in 16 days.
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90 Mins English English100 Questions100 Marks90 Mins English English100 Questions100 Marks90 Mins EnglishX alone can complete a work in 56 days and Y alone can do it in 72 days. both completed in:
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