You're standing on a pedestrian bridge over a highway. a car that has just passed under the bridge honks, and at the same time the honk from a truck approaching the bridge reaches your ears. assume the speed of sound in air is 342 m/s. a) what frequency do you hear when the car honks? the car's speed is 22.1 m/s, and its horn's frequency is 626 hz. b) the frequency of the truck's horn is 533 hz, but by an amazing coincidence, its frequency sounds exactly the same to you as the car's horn. what is the truck's speed? c) suppose the car is 18.58 m from you, while the truck is 11.31 m away. do the two honks interfere constructively, destructively, or neither? show all work and explain.