Two pipes can fill a tank in 10 hrs. and 12 hrs. respectively while a third pipe

Question

Two pipes can fill a tank in 10 hrs. and 12 hrs. respectively while a third pipe empties the full tank in 20 hrs. If all the three pipes operate together , in how much time the tank will be filled ?

Options:

A . 7.5 hrs

B . 5 hrs

C . 7 hrs

D . None of these

Answer: Option A
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