Two swimmers A and B, of weight 235 lb and 170 lb, respectively, are at diagonally opposite corners of a floating raft when they realize that the raft has broken away from its anchor. Swimmer A immediately starts walking toward B at a speed of 6.5 ft/s relative to the raft. Knowing that the raft weighs 300 1b, 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.