1. The leakage rate of water from a pipe, $L1{s}^{-1}$ (litres per second), is directly proportional to the square root of the flow rate,$sm{s}^{-1}$  (meters per second), which is the speed of the water flowing through the pipe. It was observed that the leaking rate was $0.72l{s}^{-1}$ when the flow rate was $0.64m{s}^{-1}$

Write down an equation connecting $L$and $S$.