state gov Bihar Vidhan Sabha DEO Mock Test 2024 Quantitative Aptitude Time and Work Work Efficiency

Three persons P, Q and R can do a job separately in 10 days, 20 days and 60 days, respectively. If they work together, then what is the time taken to complete the job?

1
8 days
2
5 days
3
6 days
4
10 days
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