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Maths Mcqs

A cistern has two taps which fill it in 12 min. and 15 min.respectively \xa0 There is one outlet pipe in the cistern. \xa0When all the taps & pipe are opened, the empty cistern is full in 20 min. \xa0How long will the waste pipe (outlet) take to empty the full cistern ?

Correct Option: A.\xa010 min

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