The temperature was -5 celsius at 6 am it increased 3/4 of a degrees every hour for six hours. the temperature then increased 1 1/2° every hour for five hours. what was the temperature at 5 pm? express your answer as an improper fraction.

Answer asap and if you do you will get brainliest. catherine buys a gallon of ice cream from the store. after taking it home, she eats a fifth of a gallon of ice cream. her sister eats some of the ice cream as well. if two-thirds of the original amount of ice cream is left, then what fraction of a gallon of ice cream did her sister eat?