Question
Q can complete a project in ‘x ‘ hours , R needs ‘0.7x’ hours to do half of The same project. R and S jointly can complete the same project in 1/3 of time taken by Q to complete the work alone. Q takes 90 hours more to complete alone as compared to time taken by all three jointly to complete the work. Find the time taken by S to complete 80% of the project alone?
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