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Three taps A, B and C are attached with a tank. A can fill the tank in 6 hours, B can fill it in 10 hours and C can fill it in 12 hours. In the beginning, only A was opened and worked for of an hour. B worked for the next of an hour and C worked for the remaining of an hour. This process was repeated till the tank was full. Which tap was open when the tank got completely filled?

 
A
B
C
Cannot be determined

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It should be C

It should be c

Answer of this question is wrong