railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Time and Work

A and B together can complete a work in 12 days, B and C together in 15 days and C and A together in 20 days. If they all work together, in how many days can they complete the work?

1
9
2
13
3
12
4
10
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