A Low Land, 48 m Long and 31.5 m Broad is Raised to 6.5 dm :

A low land, 48 m long and 31.5 m broad is raised to 6.5 dm. For this, earth is removed from a cuboidal hole, 27 m long and 18.2 m broad, dug by the side of the land. The depth of the hole will be

1. 2.2 m
2. 3 m
3. 2 m
4. 2.5 m