Two pipes fill in 10 and 15 min. Drain empties in 30 min. Net fill time?
7.5 min
The answer
Net = 1/10+1/15-1/30 = 3+2-1/30 = 4/30 = 2/15. Time = 15/2 = 7.5 min.
Source: Verified
- aptitude
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