Given:
The speed of the sound is
[tex]S=1.2\cdot10^3\frac{\operatorname{km}}{h}[/tex]To find the time for sound to travel 7.2*10 km
Speed = distance over the time
So, time will be the distance over the speed
so, the time will be:
[tex]t=\frac{7.2\cdot10}{1.2\cdot10^3}=6\cdot10^{-2}hr=0.06hr[/tex]Now, convert from hours to minutes
1 hour = 60 minutes
so, the time will be:
[tex]t=0.06\cdot60=3.6\min [/tex]So, the answer will be: time = 3.6 minutes
