Question

The temperature at 12 noon was 10'c above zero. If it decrease at the rate of 2'cper hour until midnight, what time would the temperature be 8'c below zero? what would be the temperature at midnight answer thorough clear steps

Answer 1

temperature at 12:00=10'c
10+(-2*x)=(-8)
(-2*x)=(-8)-(10)
(-2*x)=(-18)
x=(-18)/(-2)
x=9
on 9:00 pm temperature will be (-8)

Temperature at midnight
10+(-2*12)
10-24
(-14)

Answer 2

Solution : Temperature at 12 Noon = 10°C above 0°C = 10°C

             It decreases at 2° per hour.

Final temperature = 8°C below 0 = -8°C

Change in temperature = 10 - ( -8 ) = 18°C.

Rate of decrease = 2° per hour.

Time = 18 / 2 = 9 hours.

So, Time at which temperature would be 8°C below zero = 12:00 + 9:00 = 21:00

                 So, the time at which temperature goes 8°C below 0 is 9:00 PM.

Also, The temperature at 12 :00 PM = 10° C, As temperature decreases at 2°C,

Temperature at mid night = 10° C - 2 ( 12 ) = 10 - 24 = -14° C.

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