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					 A and B separately can complete a work in 6 days and 3 days respectively. If they work together, then in how many days will they complete the work ?
 
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- 4 days
 - 3 days
 - 2 days
 - 5 days
 
 
Correct Option: C
Work completed by A + B in one day = 1/6 + 1/3 = 1/2 
∴ Time taken by A + B to complete the work = 2 days.