Answer:
The speed of jogger in uphills is 4 mile per hour   
And  The speed of jogger in downhills is 10 mile per hour
Step-by-step explanation:
Given as :
The distance cover by jogger in downhill (Dd) = 5 miles
The distance cover by jogger in uphill     (Du)  = 2 miles
The time taken by jogger in downhill       (Td)  = T  hour
The time taken by jogger in uphill            (Tu)  = T hour
Let The speed of jogger in uphills            (Su)  = x mph
So ,The speed of jogger in downhills      (Sd)  =( x + 6 ) mph
∵, Time =  
 
So, Tu =  
 
Or, T =  h
   h
And Td =  
 
Or,   T =  h
  h
∵  Time duration of both is same 
∴   =
 = 
Or,  2 × (x + 6) = 5x
Or,  2x + 12 = 5x
So,    12 = 3x
∴       x =  = 4 mph
 = 4 mph
And  x + 6 = 4 + 6 = 10 mph
Hence The speed of jogger in uphills is 4 mile per hour   
And      The speed of jogger in downhills is 10 mile per hour   Answer