From point a and b, the distance between which is is 30km, two people heading toward each other that left at the same time meet in 3 hours and 20 min. if the first person where to leave 2 hours ahead the other, then they would have met in 2.5 hours after the second person had left. what is the speed of the two people

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.