Natalia drove to her grandmothers house for thanksgiving. It took her 5 hours, for a total of 225 miles. What was her average speed in miles per hour?

Abag contains 5 red marbles , 6 blue marbles and 4 green marbles. susie selects a marble and returns it to the bag before selecting another marble. if susie selects a red marble 6 out of 20 times, what is the experimental probability that the next marble she selects will be a red marble ?