Question

Tap A can fill a cistern in 21 hrs and tap B can fill the same cistern is in 15 hrs while tap C can empty the full cistern in 10 hrs . All pipes are opened together .After how many hours tap C should be closed to that the cistern will be full in 10 hrs 30 minutes
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Answer 1

Answer:

I didn't understand this question

Step-by-step explanation:

Tap A can fill a cistern in 21 hrs and tap B can fill the same cistern is in 15 hrs while tap C can empty the full cistern in 10 hrs . All pipes are opened together .After how many hours tap C should be closed to that the cistern will be full in 10 hrs 30 minutes