10 m thick confines aquifer gives the steady state discharge of 0.03 $$\frac{m^{3}}{s}$$ through the well of 50 cm radius. Due to pumping, the height of the water in the well is dropped frpm 15 m to 10 m and the radius of influence is obtained as 500 m. What is the coefficient of permeability $$(\frac{mm}{s})$$ ?

A

0.66

B

0.99

C

1.25

D

6.89