A railroad track and a road cross at right angles. An observer stands o the road 70m south of crossing and watches an eastbound train traveling at 60m/s. At how many m/s is the train moving away from the observer 4 seconds after it passes through the intersection

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?