Two rectangular sheets of paper each 30 cm × 18 cm are made into two right circular cylinders, one by rolling the paper along its length and the other along the breadth. The ratio of the volumes of the two cylinders, thus formed, is :

1. 2 : 1

2. 3 : 2

3. 4 : 3

4. 5 : 3

Two cylindrical vessels with radii 15 cm and 10 cm and heights 35 cm and 15 cm respectively are filled with water. If this water when poured into a cylindrical vessel, 15 cm in height, fills it completely then the radius of the vessel is :

1. 17.5 cm

2. 18 cm

3. 20 cm

4. 25 cm

The radius and height of a right circular cone are in the ratio of 5 : 12 and its volume is 2512 cm³. The slant height of the cone is :

(Take π = 3.14)

1. 14 cm

2. 16 cm

3. 24 cm

4. 26 cm