The Tri-Rail traveled a distance of 8,000 m at an average speed of 18 m/s. How long did it take
the Tri-Rail to travel this distance?

Time taken = 444.4s

Explanation:

how long = the time taken

and from the definition of speed,we have that :

Average speed = distance ( m)

time (s)

therefore,Time = distance (m) / average speed (m/s)

Time = 8000/18

Time = 444.4 (s)

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures