Answer:
The Charlott's speed in m/s is 2.5 m/sec
Explanation:
Given : Charlott is running at a rate of 9 km/h. 
We have to find the Charlott's speed in m/s.
Consider the given speed of Charlott is 9 km/h. 
Since, 1 km = 1000 m 
and 1 hour = 3600 sec 
Therefore, 
 becomes,
 becomes, 

Thus, The Charlott's speed in m/s is 2.5 m/sec