Current Attempt in Progress

Batman $($mass $=92\mathrm{.}0kg)$ jumps straight down from a bridge into a boat $($mass $=55\mathrm{.}9kg)$ in which a criminal is fleeing. The velocity of the boat is initially $+13\mathrm{.}3\frac{m}{s}.$ What is the velocity of the boat after Batman lands in it$?$

Number Units