A football game (physics)?

In a football game, a receiver is standing still, having just caught a p. Before he can move, a tackler, running at a velocity of +6.2 m/s, grabs him. The tackler holds onto the receiver, and the two move off together with a velocity of +1.1 m/s. The m of the tackler is 111 kg. uming that momentum is conserved, find the m of the receiver.