Question

​ The temperature at noon at a certain place was 12 degrees above zero. If it decreases at the rate of 2 degrees per hour until midnight, at what time would it be 10 degrees below zero?

Answer 1

I think its - 2 degree celcius

Answer 2

one hour before midnight (11:00) 
as it is decreasing at the rate of 2 degree per hour to reach 0 degree it need 6 hoiurs
and to reach -10 more 5 hours
SO TOTAL 11 HOURS(6+5)
11 HOURS AFTER MID DAY IS 11:00 PM