Physics ch 7 momentum and power?

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 +3.0 m/s, grabs him. The tackler holds onto the receiver, and the two move off together with a velocity of +1.7 m/s. The m of the tackler is 130 kg. uming that momentum is conserved, find the m of the receiver.