Help please with this one

Example 2 Ambient air at 20C and density 1.2kgm3 enters a fan rotating at 180rpm. The total pressure of the air delivered by the fan is 11.5kPa and the volume flow rate 4.5m3s1. (a) Calculate the ideal power input to the fan. (b) Calculate the volume flow rate, the pressure rise and the power input, (i) if the fan speed is increased to 200rpm with the same density, and (ii) if fan speed remains constant but the ambient air temperature increases to 40C