Question

The temperature at 12 noon was 10°C per hour until midpoint. If it decreases at the rate of 2°
per hour until midnight At what time would the temp be 8°C below zero?​

Answer 1

Answer:

please check this photo...ncert class 7maths

Explanation:

temperature at 12noon-10degree celsius

decreasing temp.=2degree celsius

time when it decreases 8 degre=.

10. -. (-8). = 10+8=. 18 degree Celsius.

half of 18 = 18/2= 9

so the answer is 9pm

temperature at midnight = after 9pm,,

-10. 10 pm

-12. 11pm

-14°. 12,pm