The permeability of sand in horizontal and vertical directions are 3 × 10-3 cm/sec and 1 × 10-3 cm/sec and the permeability of clay in horizontal and vertical directions are 9 × 10-7 cm/sec and 3 × 10-9 cm/sec, then the ratio of seepage loss per meter length of dam in sand to clay is:
1
105/3
2
3
3
1/9
4
9