One custodian cleans a suite of offices in 3 hrs. when a second worker is asked to join the regular custodian, the job takes only 2 hours. how long does it take the second worker to do the same job alone?

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.