Determine what speed relative to the shore an initially motionless boat with a mass of 2.5 tons acquires if a passenger weighing 85 kg

Determine what speed relative to the shore an initially motionless boat with a mass of 2.5 tons acquires if a passenger weighing 85 kg jumps on it from the shore at a speed of 1.6 meters per second.

m1 is the mass of the boat, m2 is the mass of a person, m3 is the mass of a person and a boat
v1 – boat speed (equal to zero), v2 – person speed, v3 – boat and person speed
For ZSI:
m1v1 + m2v2 = m3v3
v3 = 0.05m / s