For the problems below assume that the compressed air upstream of the choke point is Po=160 psia and To= 70F=530R and the pressure downstream is atmospheric or 14.7 psia. 1. The most elementary understanding of choked flow velocity (or sonic velocity) is to think of thunder and lightening. As a child, you were taught (I hope?) that if you see a flash of lightening you could tell how far away the strike is by counting the seconds until you hear the thunder. For every 5 seconds that you counted, the distance to the strike is 1 mile, meaning that 10 seconds represents two miles. Using this information, solve for the sonic velocity or speed of sound in air (ft/s and mph)