1. Two iron workers are on a project 72.0 m apart. To get the other’s attention, one worker strikes his lunch pail with his wrench. How long does it take the sound to travel through the air if the speed of sound under these conditions is 345 m/s?
2. A construction worker 30.0 m above the ground drops his hammer. How long does his shouted warning take to reach the ground if the speed of sound under these conditions is 345 m / s?