$10-72.$ To increase the head, two pumps from Fig. $10-26$ b using $10-$in$.$ impellers will be connected in series. The pumps will be used in a system where the overall lift is $105ft.$ The pipe has a diameter of $6$ in$.,$ a resistance coefficient $f=0\mathrm{.}018,$ and a length of $400ft.$ Assume that the minor losses total five velocity heads. Ignore the possibility of cavitation and determine the actual operating conditions of head, discharge, efficiency, and power required.