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Rate constant of a first order reaction when 60% reacts in 45 minutes

The same question, asked 2 times: 3 May 2023 S2, 16 May 2023 S2. Every wording below, oldest first.

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  1. Question 1

    3 May 2023 S2

    64
    What is rate constant of a first order reaction if 60% reactant decompose in 45 minute?

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  2. Question 2

    16 May 2023 S2

    64
    In a first order reaction 60% of the reactant converts into product in 45 minutes. Calculate rate constant of the reaction.

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