The Speed of Sound in Air Is Approximately $340 ~ { \mathrm { m } } / \mathrm { s } \text {. }$

Essay

The speed of sound in air is approximately $340 ~ { \mathrm { m } } / \mathrm { s } \text {. }$ .The speed of light in air is approximately $3 { \times } 10 ^ { 8 } \mathrm {~m} / \mathrm { s }$ .If a lightning strike occurs 3 km away, how much time elapses before you hear the
thunder?