Three seniors were seriously injured Friday night in Weehawken when a Passaic man driving large pickup truck struck a car and then hit two pedestrians while trying to flee, Hudson County Prosecutor Esther Suarez said. The initial crash occurred in the area of Avenue at Port Imperial and Port Imperial Boulevard at 9:50 p.m. when Luis Tubac-Socoy, 25, driving a Ford F-350 truck struck a Honda CRV, Suarez said. Tubac-Socoy fled in the truck and struck a 78-year-old North Bergen woman and a 70-year-old Florida woman, Suarez said. Tubac-Socoy then fled on foot, but he was arrested by the Weehawken …