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Newton's law of cooling: temperature of a body after a given time

The same question, asked 4 times: 2 May 2023 S1*, 2 May 2023 S2*, 3 May 2023 S2*, 14 May 2024 S2. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    2 May 2023 S1

    133
    A spherical metal ball at 80∘80^\circC cools in 5 minutes to 60∘60^\circC, in surrounding temperature of 20∘20^\circC, then the temperature of the ball after 20 minutes is approximately

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  2. Question 2

    2 May 2023 S2

    111
    A body cools from 100∘C100^\circ\text{C} to 60∘C60^\circ\text{C} in 15 minutes. If the surrounding temperature is 20∘C20^\circ\text{C}, the temperature of the body after cooling for one hour is

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  3. Question 3

    3 May 2023 S2

    145
    If a body cools from 80∘C80^{\circ}C to 60∘C60^{\circ}C in the room temperature of 30∘C30^{\circ}C in 30 min, then the temperature of a body after one hour is

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  4. Question 4

    14 May 2024 S2

    135
    If a body cools from 80°C80°C to 50°C50°C in a room temperature of 25°C25°C in 30 minutes, then the temperature of the body after 1 hour is

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