Question

a sound wave has a frequency of 2 kilohertz and wavelength of 45 centimetres it takes 4 second to travel calculate the distance it travels

Answer 1

velocity = frequency * lamda
v = 2000 Hz *0.45 m
v = 900 m/s
now,
distance = velocity * time 
s = 900 * 4
s = 3600 m

i hope it helps.........

Answer 2

distance  =  3600m  .................................