Q:
      
      
         
            
Wheels of diameters 7cm and 14cm start rolling simultaneously from x & y which are 1980 cm apart towards each other in opposite directions. Both of them make the same number of revolutions per second. If both of them meet after 10seconds.The speed of the smaller wheel is
         
       
      
      
      
          
      
      
          Answer & Explanation
         Answer: A) 22m/s         
         
Explanation: let each wheel make x revolutions per sec. Then
  
distance moved by smaller wheel in 3 revolutions 
= 
speed of smaller wheel =  m/s = 22m/s
       
      
      
      
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