Answers

2014-03-03T14:52:10+05:30
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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2014-03-03T22:33:43+05:30
Answer to this question is 24 hrs.
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