11. The initial rate of reaction 2A→B (measured by the accumulation of product B) is 0.00025 mol/(l*s). After 800 s it has decreased by 2 times, and after another 1160 s it has decreased by 2 times again. Find the rate constant of the second-order reaction. Will the answer change if the reaction rate was measured by the disappearance of the starting substance A?

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