Two swimmers A and B, of weight 190 lb and 125 lb, respectively, are at diagonally opposite corners of a floating raft when they realize that the raft has broken from its anchor. Swimmer A immediately starts walking toward B at a speed of 2 ft/s relative to the raft. The raft weighs 300 lb. Determine (a) the speed of the raft if B does not move (b) the speed at which B must walk toward A if the raft is not to move.