Some workers are painting a hall with length, breadth and height of 45 m, 20 m and 6 m respectively. If they can paint 10 m2 area from one liters of paint, find the amount of paint required to paint the walls and ceiling of hall.
Train X takes 6 hours to travel from station A to station B, while train Y takes 3 hours to travel from station B to station A. If train X and Y starts at same time from stations A and B respectively, after what time will they cross each other? (Assume trains travel with uniform speed)