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A and B are two substances undergoing ra...

`A` and `B` are two substances undergoing radioactive decay in a container.The half life of `A` is `15min` and that of `B` is `5min`.If the initial concentration of `B` is `4` times that of `A` they both start decaying at the same time,how much time will it take for the concentration of both of them to be same?
______________min.

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