7. TBQ - Determine the height

Water flows through a cylindrical pipe, whose inner radius is \(1\) \(cm\), at the rate of \(60\) \(cm/sec\) in an empty cylindrical tank, the radius of whose base is \(20\) \(cm\). What is the rise of water level in tank in half an hour?

 

Required height \(=\) \(cm\)