In a laboratory soil test, the sample has an area of cross section 12.50 cm2, hydraulic gradient is 2 and discharge measured is 150 ml in 120 sec. The coefficient of permeability will be _______. (Apply Darcy's law)
1
0.5 mm/s
2
0.2 mm/s
3
5.0 mm/s
4
0.1 mm/s