I need help understanding this and how to do it :)​

Which is the completely factored from of xy^3-x^3y

Math each whole number with a rational,exponential expression

Apassenger train and a freight train leave san jose at 3pm, traveling in the same direction. the passenger train is going three times as fast as the freight train. at 6pm they are 240 miles apart. how fast is each travelling? explain your answer and show your