At noon t 0 Alicia starts walking along a long straight road at 5 mi hr Her velocity decreases according to the function v t 5 t 1 for t 0 At noon Boris also starts walking along the same road with a 1 mi head start on Alicia his velocity is given by u t 3 t 1 for t20 a Find the position functions for Alicia and Boris where s 0 corresponds to Alicia s starting point b When if ever does Alicia overtake Boris