The temperature at 2 p.m was 22'C above zero.
If it decreases at the rate of 3'C per hour untill mid-night , at what time would the temperature be 2'C
below zero

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Solution

Dear student,

$I n i t i a l t e m p e r a t u r e i . e ., a t 2 p m = 22 ° C C h a n g e i n t e m p e r a t u r e p e r h o u r = - 3 ° C T e m p e r a t u r e a t 3 : 00 P M = 22 º C + (- 3 º C) = 19 º C T e m p e r a t u r e a t 4 : 00 P M = 19 º C + (- 3 º C) = 16 º C T e m p e r a t u r e a t 5 : 00 P M = 16 º C + (- 3 º C) = 13 º C T e m p e r a t u r e a t 6 : 00 P M = 13 º C + (- 3 º C) = 10 º C T e m p e r a t u r e a t 7 : 00 P M = 10 º C + (- 3 º C) = 7 º C T e m p e r a t u r e a t 8 : 00 P M = 7 º C + (- 3 º C) = 4 º C T e m p e r a t u r e a t 9 : 00 P M = 4 º C + (- 3 º C) = 1 º C T e m p e r a t u r e a t 10 : 00 P M = 1 º C + (- 3 º C) = - 2 º C T h e r e f o r e, t h e t e m p e r a t u r e w i l l b e 2 ° C b e l o w z e r o a t 10 : 00 P M .$

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The temperature at 2 p.m was 22'C above zero. If it decreases at the rate of 3'C per hour untill mid-night , at what time would the temperature be 2'C below zero

The temperature at 2 p.m was 22'C above zero.
If it decreases at the rate of 3'C per hour untill mid-night , at what time would the temperature be 2'C
below zero