Question

The temperature at noon at a certain place was 12 degrees above zero. If it decreases at the rate di 4. 2 degrees per hour until midnight, at what time would it be 10 degrees below zero? (A) 2 p.m. (B) 11 p.m. (C) 12 midnight (D) 10 p.m.



I got the answer but i do no the step​

Answer 1

Step-by-step explanation:

Temperature 10°C below zero

= 12 – ( – 10)

= 22°C

∴ Per hour 2°C decreases –

= 22/2

= 11 h

∴ (12 p.m + 11 h)

= 11 p.m

Hence, the correct answer is option (b) 11 p.m.

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