The area of the rectangle is 168 m² and the breadth of the rectangle is 12 m. If the height of the cone is 1 m more than the length of the rectangle and the radius of the cone is 20m then find the ratio of the slant height to the radius of the cone.
1
4: 5
2
3: 2
3
5: 4
4
3: 4
5
6: 5