20 10 what is the last multiple-choice question in mathematics of Anhui senior high school entrance examination?
Party A and Party B are not allowed to drive on the1200m long straight road. The running speeds of Party A and Party B are 4m/s and 6m/s respectively. Before departure, Party B is at the starting point, and Party A is in front of Party B 100 meters ... If we start at the same time, the function image of distance y(m) and time t(s) between Party A and Party B is-