Cape Town – A mother and her 17-year-old son were killed when their car collided head-on with a truck in Durbanville, Cape Town, on Thursday, paramedics said.The woman was found dead in the passenger seat and her son on the pavement, on Langeberg Road, ER24 spokesperson Russel Meiring said.Members of the public pulled him from the car. He had sustained numerous injuries and showed no signs of life.Paramedics tried to resuscitate him for 40 minutes, and got his vital signs back. He was taken to the Mediclinic Durbanville.Once there, his condition deteriorated. Hospital staff tried for another 20 minutes to revive him, but he died.The truck driver was unhurt. The collision was being investigated.