The sum of the length, breadth, and height of a room is 19 m. The length of the diagonal is 11 m. The cost of painting the total surface area of the room at the rate of Rs. 10 per m^2 is:
A cuboidal water tank contains. 216 l of water. Its depth is ⅓ of its length and its breadth is ½ of ⅓ of the difference between length and depth. The length of the tank is: 18dm