A radioactive sample contains two nuclides A and B having decay constant \lambda h r^{-1} and 2 \lambda h r^{-1}. Initially 25 \% of total decay comes from A. How long (in {hr} ) will it take before 75 \% of total decay comes from A. [ Take \lambda=\ln 3]

JEE Advanced 2020 Full Test 6 Paper 1

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A radioactive sample contains two nuclides A and B having decay constant λhr−1 and 2λhr−1. Initially 25% of total decay comes from A. How long (in hr ) will it take before 75% of total decay comes from A.
[ Take λ=ln‌3]

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