0.30 sec after seeing a puff of smoke rise from the starter's pistol the sound of the firing of the pistol is heard 100.0 m away. what is the velocity of the sound in m/s and in km/h?

Answer 1

Divide the 100 m distance by the 0.30 s time interval. That will give you sound speed in m/s. Round the result to two significant figures.

I assume you can convert m/s to km/h.

Show your work if you need further assistance.