Question

The average speed of a runner in a 400.-meter race is 8.0 meters per second. how long did it take the runner to complete the race?

Answer 1

Answer:

Time taken, t = 50 seconds

Explanation:

It is given that,

Distance covered by the runner, d = 400 m

Average speed of the runner, v = 8 m/s

Let t is the time taken by the runner to complete the race. It can be calculated using the concept of average velocity. The total distance covered divided by total time is called average speed of the runner as :

$v=\dfrac{d}{t}$

$t=\dfrac{d}{v}$

$t=\dfrac{400\ m}{8\ m/s}$

t = 50 seconds

So, the time taken by the runner to complete the race is 50 seconds. Hence, this is the required solution.

Answer 2

D = 400 m
v = 8m/s
t = ?
 v=d/t
t= d/v
t= 400/8
t= 50s