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In a 5 L container,3 moles of A are take...

In a 5 L container,3 moles of A are taken and it immediately starts decomposing with half-life of 10 minutes. After 10min, 3 moles of B are added which undergoes independent decomposition as A with half-life of 5 minutes. If both decompositions follow first order kinetics then how many minutes it will take for the concentration of A and B to become same from the time of start of decomposition of A ?

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