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water tank has three taps A - B and C. Tap A - when opened - can fill the water tank alone in 4 hours. Tap B - when opened - can fill the water tank alone in 6 hours and tap C - when opened - can empty the water tank alone in 3 hours. If taps A - B and C are opened simultaneously how long will It take to fill the tank completely ?

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water tank has three taps A - B and C. Tap A - when opened - can fill the water tank alone in 4 hours. Tap B - when opened - can fill the water tank alone in 6 hours and tap C - when opened - can empty the water tank alone in 3 hours. If taps A - B and C are opened simultaneously how long will It take to fill the tank completely ?






 
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