Q:
      
      
         
            
A man walks at a speed of 3 kmph. He doubles his speed after reaching exactly half way. He walks for 5 hours in all. What is the total distance travelled by him?
         
       
      
      
      
          
      
      
          Answer & Explanation
         Answer: D) 20 km         
         
Explanation: Let total distance be 2D.
 
He walks half distance i.e, (2D/2) = 'D' distance with 3 kmph and
The next 'D' with 6 kmph.
 
 
Using formula,
Time = Distance/speed
 
(D/3) + (D/6) = 5
 
D =10 ,
Hence, Total distance 2D  =  20 kms.
 
       
      
      
      
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