The rule of the speed is
[tex]s=\frac{d}{t}[/tex]
d is the distance
t is the time
Since the shark was swimming for 60 km, then
d = 60 km
Since the shark took 4 hours to do that, then
t = 4 hours
Divide them to find the speed of the shark
[tex]\begin{gathered} s=\frac{60}{4} \\ s=15\text{ km/h} \end{gathered}[/tex]
The shark was swimming at a speed of 15 km per hour
