Groundwater Hydrology

A fully penetrating tubewell pumps an unconfined aquifer at a constant discharge $Q = 1200\text{ m}^3\text{/day}$. At observation distances $r_1 = 15\text{ m}$ and $r_2 = 60\text{ m}$, the saturated water table heights above the horizontal impervious bed are $h_1 = 23.0\text{ m}$ and $h_2 = 24.5\text{ m}$, respectively. Using the Dupuit-Thiem formula $Q = \frac{\pi K (h_2^2 - h_1^2)}{\ln(r_2/r_1)}$, the hydraulic conductivity $K$ in $\text{m/day}$ is ________ (round off to 2 decimal places). Take $\pi = 3.1416$.