A pipe can fill a tank in 6 hours when the tank is half filled then three more pipes of sane type are opened what is the total time taken to fill the tank completely?
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Answer:45minutes
Step-by-step explanation:1pipe=1 tank full
1pipe fill 3hrs=1/2
3hr=180minute
So,4pipes=180+x
X=180/4min
X=45minutes
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