Question

the temperature 12at room was 10.c above zero. if it decreases rate at 2.c per untill midnight .at what time would the ​

Answer 1

Answer:

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At 12 noon, the temperature = 10° C above zero

The temperature is decreasing at 2° C per hour

8° C below zero = - 8° C

So, total fall in temperature from 10° C to 0° C and from 0° C to - 8° C = 18° C

Since the temperature falls 2° C in every one hour.

Therefore, to decrease 18° C, time taken = 18/2

= 9 hours

Present time is 12 noon so, the time when the temperature is - 8° C

= 12 noon + 9 hours

So, The time at which the temperature will be - 8° C = 9 PM

At 9 PM, the temperature is - 8° C, the temperature at 12 midnight will be =

(- 8° C) + (- 2° C × 3 hours)

= (- 8° C) + (- 6° C)

= - 14° C

So, at 12 midnight the temperature will be - 14° C.

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Answer 2

Answer:

Therefore, the temperature will be 8°C below zero at 9:00 PM. It will take 12 hours to be midnight (i.e., 12:00 AM) after 12:00 noon. Therefore, the temperature at midnight will be 14ºC below 0.