Need help with this problem

The number if marbles of different colors stored in a hat is listed below: 4 red marbles 10 green marbles 7 blue marbles. without looking in the hat, dan takes out a marble at random. he replaces the marble and then takes out another marble from the hat. what is the probability that dan takes out a blue marble in both draws?

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?

The volume of a box varies directly with its length if a box in the group has a length of 30inches and k=24 what is its volume