A large fresh water reservoir has two types of drainage system - small pipes and large pipes. 6 large pipes ,on their own,can drain the reservoir in 12 hours. 6 small pipes,on their own, can drain the reservoir in 18 hours. How long will 6 large pipes and 6 small pipes take to drain the reservoir
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I am ishitpanchpal from David sahibabad
I am ishitpanchpal from David sahibabad
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