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ATQ,
Fraction of work completed by 'Ramesh' = (24/40) = (3/5)
Remaining work = 1 - (3/5) = (2/5)
Time taken by 'Suresh' to complete (2/5)th of the work = 30 days
Time taken by 'Suresh' to complete the whole work = 30 × (5/2) = 75 days
Therefore, time taken by 'Suresh' to complete 75% of the work = 0.75 × 75 = 56.25 days
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