Verified Answer :

jhonyy9

so hiked 4km ----- 1 hour = 60 min. 
               14 km ----- x
             --------------------------
               x = 1460/4 = 1415 = 210 min.  = 3 h 30 min. 

and so again hiked 15 km by 5km/h

 so 5km ------------- 1 hour =60 min. 
     12 km ------------ x
  ----------------------------
       x = 1260/5 = 1212 = 144 min = 2 h 24 min.  

so total 3 h 30 min. +2 h 24 min. = 5 h 54 min. 

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