Generate a rule that will enable you to properly place any five digits in a problem of a 3-digit number multiplied by a 2-digit number that will result in the maximum product

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