The students in Mr. Davis's history class are preparing for a major presentation by reviewing a 2000-page research paper. Three friends, David, Emily, and Frank, decide to divide the paper among themselves. David reads a page in 10 seconds, Emily reads a page in 12 seconds, and Frank reads a page in 15 seconds. If they divide the paper into three sections so that each reads for the same length of time, how many seconds will each have to read?