A tank can be filled by pipe a in 3 hours and by pipe b in 5 hours. When the tank is full it can be drained by pipe C in 4 hours. If the tank is initially empty and all three pipes are open how many hours will it take to fill up the tank ?

A ) 1 9/17

B ) 9 9/17

C ) 3 9/17 ✅

D ) 9/17

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