The temperature at 12 noon was 10 above 0 if it decreases at the rate

1.	The temperature at 12 noon was 10 above 0 if it decreases at the rate of 3 per hour until midnight at what time would the temperature be 8 below zeroclass 7
Answer» Answer :- 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 hours) = (- 8° C) + (- 6° C) = – 14° C So, at 12 midnight the temperature will be – 14° C.

The temperature at 12 noon was 10 above 0 if it decreases at the rate of 3 per hour until midnight at what time would the temperature be 8 below zeroclass 7

Answer»

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 hours)

= (- 8° C) + (- 6° C)

= – 14° C

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