Question

an a.c cool the room at the rate of 5 degree per hour what would be the final temperature of the room after 6 hour if the intial temperature of the room is 40 degree

Answer 1

the room temperature will be 10 degree because

40-30=10

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Answer 2

degreess per hour = 5
hours = 6 hrs
initial temp = 40 degree
 6 hours = 5 × 6 ≈ 30 degree
temp now = 40 degree - 30 degree 
so after 6 hours temprature will be 10 degree