The Portion of a Ditch 48 m Long :

The portion of a ditch 48 m long. 16.5 m wide and 4 m deep that can be filled with stones and earth available during excavation of a tunnel, cylindrical in shape of diameter 4 m and length 56 m is ( take p=22/7)

1. 2/9 part
2. ½ part
3. ¼ part
4. 1/9 part