The north-south streets of a grid have block lengths of 250m and the east-west streets have block lengths of 200 m. Desired speeds of progression are 45 km/h north-south and 35km/h east-west. Determine the appropriate alternate systems, cycle, and actual speeds of progression for two-way progression in both orientations of the grid. Round the cycle to the nearest 5 s.[20pt]

At steady state, air at 200 kpa, 325 k, and mass flow rate of 0.5 kg/s enters an insulated duct having differing inlet and exit cross-sectional areas. the inlet cross-sectional area is 6 cm2. at the duct exit, the pressure of the air is 100 kpa and the velocity is 250 m/s. neglecting potential energy effects and modeling air as an 1.008 kj/kg k, determine ideal gas with constant cp = (a) the velocity of the air at the inlet, in m/s. (b) the temperature of the air at the exit, in k. (c) the exit cross-sectional area, in cm2