Question
Peter and Rachel can complete a project together in 20
days. Peter takes four times as long as Rachel to complete the same project alone. Find the time taken by Rachel to complete the project alone.Solution
ATQ, Let Rachel's time to complete the project alone be 'r' days. Therefore, Peter's time is '4r' days. Their combined work rate is (1/r) + (1/4r) = (1/20). 
Rachel can complete the project alone in 25 days.
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