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ATQ,
Let the total work = 60 units (LCM of 20 and 60)
Combined efficiency of 'Rahul' and 'Amit' = (60/60) = 1 unit/day
Combined efficiency of 'Rahul', 'Amit', and 'Vikram' = (60/20) = 3 units/day
Efficiency of 'Vikram' = 3 - 1 = 2 units/day
Time taken by 'Vikram' to complete the work alone = (60/2) = 30 days
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