A cuboid with dimensions 12 cm x 9 cm x 2 cm is made of a metal. It is melted and recast into a solid cube. The edge of the cube is :

1. 6 cm

2. 12 cm

3. 15 cm

4. 8 cm

The dimensional ratio of the sides of a cuboid is 3 : 2 : 1. If its volume is 1296 cm³; the actual dimensions of the cuboid are :

1. 12 cm, 12 cm and 8 cm

2. 8 cm, 8 cm and 12 cm

3. 12 cm, 12 cm and 12 cm

4. 18 cm, 12 cm and 6 cm

Through the pipe of uniform cross-section (12 cm²) water flows with the speed of 20 cm/s. The volume of water that flows in 1 minute is :

1. 0.0144 m³

2. 0.144 m³

3. 144 cm³

4. 240 cm³