Aperson in a car travelling at 108 kilometers per hour takes 1 second to go past a building on the side of the road calculate the length of the building in meters

Hi,
The length of the building in meters is 30 meters
How I got my
Convert kilometres into meters.
To covert to meters from kilometres, multiply with 5/18
108 Km=(108*5/18)m
108Km=30m/s
time=1 sec  speed=30m/s d=?
d=s*t
d=30*1
d=30 meters
Length of the building in meters is 30 meters.
Hope this helps you.