Please actually answer the question

Henry is an avid reader, he devours 90 pages in half an hour how many pages has henry read per minute?

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

Astudent showed the steps below while solving the inequality |x-4|< 1 by graphing.