QUESTION $6$

A $0\mathrm{.}75-m$ radius well fully penetrates a $24-m$ thick unconfined aquifer and is pumped at a rate of $10\frac{L}{s}.$ The drawdown in an observation well $30m(r_1)$ from the pumped well is $1\mathrm{.}6m(z_1)$ after a long period of pumping. The drawdown in another observation well $60m(r_2)$ from the pumped well is $1\mathrm{.}1m(z_2)$ after the long period of pumping. Determine

$($c$)$ the radius of influence of the pumped well in $m_{?}.$

Pumping well

I