8 taps having the same rate of flow ,fill the tank in 27 minutes .if 2 tapes ,go out of order how long will the remaining tapes take to fill the tank ???

Answer : 

8 tabs can fill the tank in 27 minutes 
So,
1 tab can fill the tank in 27 ×8  =  216 minutes 
Therefore
6 tabs can fill the tank in 2166  =  36 minutes .                                     ( Ans )

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