New York and Chicago are 800 miles apart. A train leaves New York for Chicago and travels at an average speed of 50 mph. Another train leaves Chicago for New York at the same time and travels at an average spped of 40 mph. How far apart will the two trains be after six hours?

Abag contains 3 red marbles, 2 blue marbles, and 2 green marbles. one marble is picked, then another marble. assume that the selections are made with replacement. a) find the probability of picking two red marbles with replacement. b) find the probability of picking a red marble and a blue marble. assume the selections are made without replacement. c) find the probability of picking two red marbles without replacement. d) find the probability of picking a red marble and a blue marble without replacement.