One grocery clerk can stock a shelf in 20 minutes, whereas a second clerk requires 30 minutes to stock the same shelf. If the two clerks worked together, how long would it take them to stock the shelf ?

• clerk 1 complete a piece of work in 1 min=1/20
  clerk 2 complete a piece of work in 1 min=1/30
  both can complete a piece of work in 1 min=1/20+1/30=5/60=1/12
  ans is 12 min
  
  
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