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One tap can fill a tank in 3hours and a ...

One tap can fill a tank in 3hours and a leak can empty it in 5 hours. If the tap and the leak (which was half closed) were left open, how long will it take for the tank to fill?
एक नल किसी टंकी को 3 घंटे में भर सकता है और एक छेद इसे 5 घंटे में खाली कर सकता है | यदि नल एवं छेद (जो आधा बंद था ) को खुला छोड़ दिया जाए, तो टंकी को भरने में कितना समय लगेगा ?

A

`4 2/7` hours

B

`5 1/3` hours

C

`6 2/3` hours

D

`7 1/2` hours

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