Question 388268
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Hi, 
D = r*t, distances the same, 13/4 hr =  3.25hr
Let t and (3.25hr-t) represent the times at 8kmph and 5kmph respectively
 8kmph*t = 5kmph*(3.25hr-t)  
solve for t 
    13kmpht = 5kmph*3.25hr
         t = 5*3.25/13kmph 
         t = 1.25hr    
   8kmph*1.25hr = km, the distance walked at 8kmph  
The total distance walked entirely = 20km