1. A cistern normally takes 10 hours to be filled by a tap. But because of a leak, it takes 2 hours more. In how many hours will the leak empty a full cistern ?






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  • By: anil on 05 May 2019 01.54 am
    let the capacity of tank be 10 units time taken to fill the tank = 10 h therefore a tap fills units per hour = 1 unit due to leak time taken to fill the tank= 10+2 =12 hrs in 12 hrs tap would have filled 12 units but, due to leak it filled 10 units [as mentioned in the question] so therefore due to leak 2 units were lost in 12 hrs so to empty the tank would lose every 2 units 12 hrs this means it will take 5*12 = 60 hrs to empty the tank
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