Two pipes a fill a tank in 10 hours and 12 hours respectively, while a – McqOptions

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1.	Two pipes a fill a tank in 10 hours and 12 hours respectively, while a third pipe empties the full tank in 20 hours. If all the three pipes operate simultaneously, in how much time the tank will be filled?
A.	7 hrs.
B.	8 hrs.
C.	7 hrs. 30 minutes.
D.	8 hrs. 30 min.
Answer» D. 8 hrs. 30 min.

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