One day Alonso decided to keep a record of the time he spent walking and the distance he walked. Which of the following are true about the data shown?

Jonathan can type 20 documents in 40 minutes ,and susan can type it in 30 minutes and jack can type it in 24 minutes working together ,how much time will it is take them type the same document

The anwser cause i do not understand just plez

Aweekly newspaper charges $72 for each inch in length and one column width. what is the cost of an ad that runs 2 column inches long and 2 columns wide? its not 288