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A cistern is normally filled by a tap in 5 hours, but suddenly a leak develops and it empties the full cistern in 30 hours with the leak, the cistern is filled in1). 8 hours2). 6 hours3). 10 hours4). 7.5 hours |
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Answer» WORK DONE by a tap in one HOUR = 1/5 Work done by leak in one hour = 1/30 Total work done in 1 hour = {(1/5) – (1/30)} = 1/6 ∴ Required time = 6 HOURS |
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