Three valves when opened individually, can drain the water from certain tank in 3, 4 and 5 minutes respectively, What is the greatest part of the tank that can be drained in one minute by opening just two of valves.

Created: 1 year ago | Updated: 1 year ago

Updated: 1 year ago

\frac{7}{12}

\frac{1}{2}

\frac{1}{4}

\frac{1}{5}

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