The answer is 1/16.
Half-life is the time required for the amount of a sample to half its value.
To calculate this, we will use the following formulas:
1. 

,
where:
<span>n - a number of half-lives
</span>x - a remained fraction of a sample
2. 

where:
<span>

 - half-life
</span>t - <span>total time elapsed
</span><span>n - a number of half-lives
</span>
So, we know:
t = 10 min
<span>

 = 2.5 min
We need:
n = ?
x = ?
</span>
We could first use the second equation to calculate n:
<span>If:

,
</span>Then: 

⇒ 

⇒ 

<span>
</span>
Now we can use the first equation to calculate the remained fraction of the sample.
<span>

</span>⇒ 

<span>⇒

</span>
 
        
        
        
A switch connects with multiple devices, such as, computers, wireless access points, printers, and servers. 
For example, this quote states that "Switches are key building blocks for any network. They connect multiple devices, such as computers, wireless access points, printers, and servers; on the same network within a building or campus. A switch enables connected devices to share information and talk to each other."
 
        
             
        
        
        
I think it's 11.56 minutes