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Two substances A and B are present such ...

Two substances A and B are present such that [A]=： 4 [B] and half life of A is 5 minute and of B is 15 minute. If they start decaying at the same time following first order, how much time later will the concentration of both of them would be same

A

15 minute

B

10 minute

C

5minute

D

minute

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The correct Answer is:
A
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