Q4 of 94 Page 45

A tap A can fill a drum in 10 minutes. A second tap B can fill in 20 minutes. A third tap C can empty in 15 minutes. If initially the drum is empty, find when it will be full if all taps are opened together?

Time taken by A = 10 min

Work done by A in 1 min =


Time taken by B = 20 min


Work done by B in 1 min =


Time taken by C = 15 min


Work done by C in 1 min =


Work done by all three A, B & C in 1 min = + - =


Time taken by all three A, B & C in = 12 min


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