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a tank has two outlets A and B, which to...

a tank has two outlets A and B, which together take 6h to empty a full tank when they are opened simultaneously. the tank was initially half full and both the outlets were opened. After an hour an inlet pipe X was also opened. If the inlet alone can fill an empty tank in 4h, how much time will it now take to fill the tank completely? (in hours) `8` b. `7` c. `9` d. `8 1/2`

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RS AGGARWAL-PIPES AND CISTERNS-All Questions
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