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?
- 36 minutes
- 12 minutes
- 24 minutes
- 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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