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Square plate contracting at a given rate of area: rate the perimeter falls

The same question, asked 2 times: 9 May 2023 S2*, 10 May 2024 S1. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    9 May 2023 S2

    109
    A square plate is contracting at the uniform rate 3 cm2^2/sec, then the rate at which the perimeter is decreasing, when the side of the square is 15 cm, is

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  2. Question 2

    10 May 2024 S1

    102
    Square plate contracting at 4 cm2^2/sec. Rate of decrease of perimeter when side = 20 cm is

    Tap an option to check your answer.