Three taps A, B, C together can fill an empty cistern in 5 min. Tap A alone can fill in 20 min and tap B alone in 10 min. How long will tap C alone take to fill it?
Explanation
According to the above given formula, If pipe A and B fills a tank in x and y hours respectively, but a third pipe C empties the full tank in z hours then the net portion filled in 1 hour when all of them are opened together is hours.
According to the question x+y+z=10
So,
Upon cross multiplication,
Therefore, the tank will be emptied in 20 minutes.
Hence option B is correct
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