Q:
      
      
         
            
In a 500 m race, the ratio of the speeds of two contestants A and B is 3 : 4. A has a start of 140 m. Then, A wins by:
         
       
      
      
      
          
      
      
          Answer & Explanation
         Answer: C) 20m         
         
Explanation: To reach the winning post A will have to cover a distance of (500 - 140)m, i.e., 360 m.
 
While A covers 3 m, B covers 4 m.
 
While A covers 360 m, B covers (4/3)*360 = 480 m.
 
Thus, when A reaches the winning post, B covers 480 m and therefore remains 20 m behind.
 
 A wins by 20 m.
       
      
      
      
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