We have the next information
v=speed =85km/hr
t=30 sec
First we need to convert 85km/hr to m/s
[tex]1\frac{m}{s}\times\frac{1\text{ km}}{1000m}\times\frac{3600s}{1hr}=3.6\text{ km/hr}[/tex]
the equivalence to convert km/hr to m/s is
1 m/s =3.6 km/hr
[tex]\frac{85}{3.6}=23.611\text{ m/s}[/tex]
then we will use the next formula in order to know the distance
[tex]v=\frac{d}{t}[/tex]
where v is the speed , d is the distance and t is time
In order to find the distance we need to isolate d of the formula above
[tex]d=v\cdot t[/tex]
in our case
v=23.611 m/s
t=30 sec
we substitute the values
[tex]d=23.611\cdot30=708.33\text{ m}[/tex]
The answer is 708.33 m
