Two swimmers A and B, of weight 190 lb and 125 lb, respectively, are at diagonally opposite…

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