A - Questions Al. Boat A is at (3, 1) at time 0 and has a constant velocity of (5, 3). Boat B is at (9, 3) at time 0 and has a constant velocity of (-2, 1). (a) Take A(t) to be the position of Boat A at time t. Find a formula for A(t). (b) Take B(t) to be the position of Boat B at time t. Find a formula for B(t). (c) Determine the distance d(t) between the two boats at time t. (d) Find the time at which the boats are closest together