Question: P and Q complete 80% of the work if they work together and Q and R complete 50% of the work together in the same time. If all 3 work together for the same duration, they would complete 100% of the work. Also, no one else is working other than P, Q and R. Who is least efficient among the three?
1) P 2) Q 3) R 4) All are equally efficient 5) Can’t be determined
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