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Step-by-step explanation:
Effeciency ratio of P:Q is 5:2
Effeciency ratio of Q:R is 4:5
Therefore Effeciency ratio of P:Q:R is 10:4:5
Given,
R completes 1/4 of the work in 5 days.
Therefore it can complete whole work in 20 days.
Total work = 5*20 = 100
Days taken by P,Q,R to complete whole work = 100/19 = 5 5/19 days
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