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By using unitary method ,
P's work:
6 days -------> 1/2 work
1 day --------> X
=> X = 1/6/2 = 1/12 work
Q's work :
4 days ------->2/3 work
1 day ----------> Y
=> Y = 2/3×4 = 1/6 work
The work sone by both in one day = X + Y = 1/12 + 1/6 = 1/4
=> 1/4 of work -------> 1 day
3/4 of work -------> Z days
=> Z = 1/1/4 ×3/4 = 4×3/4 = 3days
∴ They require 3 days to complete 3/4 of work
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