A sample of coarse sand is tested in a constant head permeameter. The sample has a cross-sectional area of 50 cm2 and a height of 10 cm. Under a constant head of 1 m water flows for 15 min and the volume of water collected is 1000 cc. The coefficient of permeability of the soil is A × 10-3 cm/sec. The value of A is ___
1
2.2
2
1.1
3
4.4
4
8.8