Karen has a summer job as a swim instructor. she gets paid $4 per hour for the first 20 hours and $6 per hour for each hour in the week. karen's goal is to earn $104 per week. how many hours of overtime per week will she need to achieve her goal?

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