Tap A can fill a water tank in 25 minutes. tap B can fill the same tank in 40 minutes and tap C can empty that tank in 30 minutes. If all the three taps are opened together, in how many minutes will the tank be completely filled up or emptied.
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Required answer = (25 x 40 x 30) / (40 x 30 + 25 x 30 - 25 x 40)
= 600 / 19 = 3111/19 minutes
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