Question

The temperature at 12 noon was 10°c above zero. If it decreases at rate of 2°c per hour untill midnight. What would be the temperature at midnight .​

Answer 1

Step-by-step explanation:

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The temperature at 12 noon was 10°c above zero. If it decreases at rate of 2°c per hour untill midnight. What would be the temperature at midnight .

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The temperature at 12 noon = 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 hr))

= (- 8° C) + (- 6° C)

= – 14° C

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

Answer 2

Answer:

-14°c

Step-by-step explanation:

The temp. at 12 noon was 10°c above 0,

Which means temp. was 10°c

It decreases at 2°c per hr. untill midnight.

Which means temp. will decrease untill 12 pm.

So, total decrease in temp.=2°c × 12=24°c

The initial temp. was 10°c.

Hence, at midnight the temp. will be=10°c-24°c=-14°c.

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