A composite residential and park areas is proposed for construction. The inlet times to the manholes for areas AA to At are 25, 30, 45 and 55 minutes respectively. The coefficients C for areas Aa to Ac are 0.7,0.5.0.6 and 0.32 respectively. The time of travel between manhole t to 2 is 7 minutes, 2 to 3 is 5 minutes and between 3 and 4 is 12 minutes. Find the 20 .year peak flow at each inlet that will be used for storm design