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Tap A fills a tank in 20 hours while tap B fill it in 30 hours .If they are opened on alternate hours and if A was opened first, in what time will the tank

be full.


Since A takes 20 hours and B takes 30 hours thus if we open them together they will take 12 hours.but since we are opening alternatively thus  time taken by those two taps will be 24 hours.
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Answer to this question is 24 hrs.
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