一道数学题,不知道题目本身有没问题

distance(in miles) from Centerville freight train -10t+115 passanger train -20t+115 the expression in the table above give the distance of each of two trains from Centerville at t hours after 12:00 noon.At what time will the trains be equidistant from Centerville ? A1:30pm B 3:30pm C 5:10pm D 8:50p.m E 11:30 p.m