单选题 Tom reads at an average rate of 30 pages per hour, while Jan reads at an average rate of 40 pages per hour. If Tom starts reading a novel at 4: 30, and Jan begins reading an identical copy of the same book at 5: 20, at what time will they be reading the same page?
(A) 9:30 (B) 9:00 (C) 8:40
(D) 7:50 (E) 7:00