Answer :
equation of the travel of the truck: y = 80.x (x in hours)
equation of the travel of the car : y = 90(x - 1/3)
when they meet: 80x = 90x - 30 => 10x = 30 => x = 3h
They'mm meet after 3 hours
equation of the travel of the car : y = 90(x - 1/3)
when they meet: 80x = 90x - 30 => 10x = 30 => x = 3h
They'mm meet after 3 hours