A subway train has a sound intensity level of 90 dB, and a rock band has a sound intensity level of 110 dB. How many times greater is the sound intensity of the band than that of the train?

In the air (assuming 0% humidity), it turns out that the speed of sound depends only on temperature. At 0C (32F), the speed of sound is about 331 m/s. At 20C (69F), the speed of sound is about 343 m/s.Consider two friends who stand 200 m apart (about the length of two football fields). One friend claps her hands. How long (in s) after the clap does the sound reach the other friend? Use 343 m/s for the speed of sound.

If a sound travels 343 m/s, calculate how fast it moves in miles per hour. Use the fact that 1 kilometer is 1,000 m, and 1 mile is 1.61 kilometers. Remember that 60 seconds are in a minute, and 60 minutes in an hour.