Question

The temperature at midnight was 2°C below zero. If it increases at the rate of 2°C per hour, find the temperature at 4 a.m.

Answer 1

REQUIRED ANSWER:-

6°C

Step-By-Step Explanation:-

Temperature at midnight= 2°C below zero= -2°C

Temperature change rate= +2°C per hour

Time = Midnight to 4 a.m.= 4 hours

Total change in temperature

= Temperature change rate × Time

= +2°C× 4 hours

= +8°C

Therefore, Final Temperature (at 4 a.m.) = Original temperature + Temperature change

= -2°C+ (+8°C)

= -2°C + 8°C

= 6° C

Therefore, the temperature at 4 a.m. is 6°C.

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Answer 2

The temperature at 4 a.m. = 6°C

Given :

• The temperature at midnight was 2°C below zero.

• It increases at the rate of 2°C per hour

To find :

The temperature at 4 a.m.

Solution :

Step 1 of 2 :

Calculate total increase in temperature

The temperature is increasing at the rate of 2°C per hour

The time between midnight and 4 a.m. = 4 hours

∴ Total increase in temperature in 4 hours

= 2°C × 4

= 8°C

Step 2 of 2 :

Calculate temperature at 4 a.m.

Initial temperature

= 2°C below zero

= - 2°C

∴ The temperature at 4 a.m.

= Initial temperature + Total increase in temperature in 4 hours

= - 2°C + 8°C

= 6°C

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