Can sum1 help me i don’t understand the problem

Pls brainliest will be awarded if answer is correct

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

How do i take any fraction and make it into a decimal or percentage?