Question

15) The temperature of 12 noon was 12°C above zero. If it decreases at the rate of 3°C per hour until midnight, at what time would the temperature be 9°C below zero? What would be the temperature at midnight?

Answer 1

Step-by-step explanation:

temperature of 12 noon = 12° c

decrease rate of temperature= 3°c

temperature at 1 pm = (12- 3)° c = 9°c

temperature at 2 pm = (9- 3)°c = 6°c

temperature at 3 pm = (6- 3)° c = 3°c

temperature at 4 pm = (3- 3)° c = 0°c

temperature at 5 pm = (0- 3)° c = -3°c

temperature at 6 pm = (-3 - 3)° c = -6°c

temperature at 7 pm = (-6 - 3)° c = -9°c

Hence , At 9 pm temperature be 9°c below zero.

temperature of 12 noon = 12° c

duration between 12 noon to mid night = 12 hours

decreasing rate = 3° c per hour

total decrease in temperature = 12 x 3°c = 36° c

temperature at midnight = temperature of noon - 36 ° c

= 12 - 36 = -24 ° c