[" 1) "2 pi sqrt(2)s" ."],[" Two cars moving in opposite directions approach each other with speed of "22m/s" and "],[16.5m/s" respectively.The driver of the car blows a horn having a frequency "400Hz" ."],[16.5m/s" respectively the driver of second car is [velocity of sound is "340m/s]" ."],[" The frequency heard by the driver of second car is [velocity of sound is "340m/s]" ."],[" The frequency heard by the driver of second car is [velocity of sound is "340m/s]" ."]