Answer:
Kennan will be from home approximately an hour and 48 minutes.
Step-by-step explanation:
We must know that total time ( ) that Keenan will be from home is the sum of run (
) that Keenan will be from home is the sum of run ( ), hang out (
), hang out ( ) and walk times (
) and walk times ( ), measured in hours:
), measured in hours:

If Keenan runs and walks at constant speed, then equation above can be expanded:

Where:
 ,
,  - Run and walk distances, measured in miles.
 - Run and walk distances, measured in miles.
 ,
,  - Run and walk speeds, measured in miles per hour.
 - Run and walk speeds, measured in miles per hour. 
Given that  ,
,  ,
,  and
 and  , the total time is:
, the total time is:

 (
 ( )
)
Kennan will be from home approximately an hour and 48 minutes.