Directions: Read the following information carefully and answer the following questions.
There are four friends A, B, C, and D who are reading their own History books. D is the first person who starts reading the book and 15 minutes after him C starts reading the book. Both D and C read the same page after some time, and T minutes later of this time B starts reading the book. The speeds of reading the pages after every 5 minutes for A, B, C, and D is 3.5, 4, 3, and 2.5 respectively. A starts reading the book some minutes after both B and C complete reading the same page. Person B and C completed reading the 240th page of the book at the same time. Each book has the same number of pages.
Just after A started reading the book, B started reading in the reverse order because of which both A and B read the Xth page at the same time. Find X if A started reading the book 20 minutes after B and C read the same page. Use the approximate value.