Q:
      
      
         
            
Three friends J, K and L jog around a circular stadium and complete one round in 12, 18 and 20 seconds respectively. In how many minutes will all the three meet again at the starting point.
         
       
      
      
      
          
      
      
          Answer & Explanation
         Answer: D) 3         
         
Explanation: All the three friends will meet at the starting point again after X seconds, such that X is the LCM of the times taken by J, K and L to complete one round.
=> LCM of 12, 18 and 20 = 180 seconds = 3 minutes.
Hence 3 minutes is the answer.
       
      
      
      
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