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A completes a job in 20 minutes and B does so in 30 minutes. If they do same job together, how much time will they take?
  1. 36 minutes
  2. 12 minutes
  3. 24 minutes
  4. None of these
Explanation

A's rate = 1/20 job/min

B's rate = 1/30 job/min

Together rate = 1/20 + 1/30

= (3+2)/60

= 1/12 job/min

Time = 1 / (1/12) = 12 minutes

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