A lawn sprinkler has 20 holes, each of cross-sectional area $2.0\times {10}^{-2}{\mathrm{cm}}^2$ and is connected to a hose pipe of cross-sectional area $2.4{\mathrm{cm}}^2$ If the speed of water in the hose pipe is $1.5{\mathrm{ms}}^{-1}\text{, }$ the speed of water as it emerges from the holes is