Sound travels an average of 343 m/s. How long does i take for sound to travel 1 km?

Time taken
= Distance / speed
= (1 km) / (343 m/s)
= (1000 m) / (343 m/s)
= 2.92 s

Roughly 3 seconds.

There are 1,000 metres in a kilometre.
Work it out. Its your homework.

Given,

speed (v) = 343m/sec

distance (s) = 1km = 1000m

time (t) = ?

We know that:-

speed (v) = distance (s)/time (t)

time (t) = distance (s)/speed (v)

= 1000/343 = 2.92sec

Time (t) = 2.92sec

1000/343=2.915s