Susan reads a book at rate of 1 page every 3 minutes. if her reading rate remains the same ,which method could be used to determine the number of minutes for her to read 18 pages?

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field