campus placement Deloitte Test Series Quantitative Aptitude Time and Work Work Efficiency

X can do a piece of work in ‘p’ days and Y can do the same work in ‘q’ days. Then the number of days in which X and Y can together do that work is:

1

(p + q)/2

2

1/p + 1/q

3

pq/(p + q)

4

pq

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