Q: In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.
The speed of sound is the distance travelled per unit time by a sound wave as it propagates through an elastic medium. In dry air at 0 C (32 F), the speed of sound is 331.2 metres per second (1,087 ft / s; 1,192 km / h; 741 mph; 644 kn). At 20 C (68 F), the speed of sound is 343 metres per second (1,125 ft / s; 1,235 km / h; 767 mph; 667 kn), or a kilometre in 2.91 s or a mile in 4.69 s.
A:
what is the speed of the sound in air