1.

A tank can be filled by tap A in 5 hours and tap B in 4 hours. Tap C can empty the filled tank in 8 hours. When the tank is empty, all three taps are opened simultaneously, how long will it take to fill the tank completely?

A. \(\frac{10}{3}\) hours
B. \(\frac{40}{13}\) hours
C. 8 hours
D. \(\frac{10}{7}\) hours
Answer» C. 8 hours


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