Question

Three taps are fitted in a cistern. The empty cistern is filled by the first and second tap in 3 and 4 hrs respectively. The full cistern is
emptied by the third tap in 5 hrs.If all three taps are opened simultaneously, the empty cistern will be filled up in
2 hrs
3 14 hrs
3 hrs
None of these
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Answer 1

Answer:

none of these is the answer