Let V be the pages per day for Vitya and D be the pages per day for Dima. V = 3D. In 3 days, Vitya read 3V pages and Dima read 132 + 3D pages. Since Vitya caught up, 3V = 132 + 3D. Substitute V = 3D: 3(3D) = 132 + 3D => 9D = 132 + 3D => 6D = 132 => D = 22. Then V = 3 * 22 = 66. Vitya read 66 pages per day.