14. Exemplar Example Problems III

A canal is \(300\) \(cm\) wide and \(120\) \(cm\) deep. The water in the canal is flowing with a speed of \(20\) \(km/h\). How much area will it irrigate in \(20\) minutes if \(8\) cm of standing water is desired?

 

Required area \(=\) hectars.