Lillian and Khadija are reading the same book. At the beginning of the month, Lillian was on page $40$ and Khadija was on page $10.$ Lillian will read $15$ pages per day and Khadija will read $20$ pages per day. Let L represent the page of the book that Lillian is on at the end of t days into the month, and let K represent the page of the book khadija is on at the end of t days into the month. Graph each function and determine whether Lillian or Khadija is farther along in the book after $4$ days.