A Cistern is filled by pipe A in 9 hrs and the full Cistern can be leaked out by

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✪ Choose the correct option.

A Cistern is filled by pipe A in 9 hrs and the full Cistern can be leaked out by an exhaust pipe B in 10 hrs. If both the pipes are opened in what time the Cistern is full?

A. 45
B. 90
C. 44835
D. 1/90

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