Question

The velocity of sound in air (under normal conditions) is

Answer 1

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.

Answer 2

Speed of Sound

The speed of sound is the distance travelled per unit time by a sound wave as it propagates though an elastic medium.

Under normal Conditions ,
(20°C ),
The Speed of sound is 343 m/s.
It can also be written as
1,125ft/s ,1,235km/h or 767mph.


Hope, you understand my answer and it may helps you.