Three valves, when opened individually, can drain the water from a 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?
A. 7/12
B. 4
C. 5
D. 7
সঠিক উত্তরঃ
A.
7/12
Explanation:
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