Amotorboat traveling a distance of 120 miles in 3 hours while traveling with the current. against the current, the same trip took 4 hours. find the rate of the boat in calm water and the rate of the current.

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?