P can do (1/4)^th of work in 10 days, Q can do 40% of the work in 40 days and R can do (1/3)^rd of the work in 13 days. Who will take minimum time and complete the work first?

Using the unitary method, P takes 10 days multiplied by 4, yielding 40 days to complete the full work. Q takes 40 days divided by 0.40, yielding 100 days to complete the full work. R takes 13 days multiplied by 3, yielding 39 days to complete the full work. Comparing the total times of 40, 100, and 39 days, R takes the minimum time and finishes first.

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