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Tap A can fill a tank in 10 hours. Tap B can fill 25% part of the same tank in 3 hours, whereas Tap C can alone empty a tank in ‘x’ hours. 2/5 part of the tank is filled in 3 hours, when all three taps are opened together. How much time (in hours) will Tap A and C together will take to fill 20% part of the tank?

A 10 hours

B 6 hours

C 4 hours

D 5 hours

E None of these

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