A can do a work in 15 days and B in 30 days. If they work on it together, then in how many days will they be able to do 50% of the work?
Let total work = L.C.M of 15&30 = 30units
A's efficiency = 30/15 = 2
B's efficiency = 30/30 = 1
To complete 50% of work, i.e; 15 units of work,
both can take $$\frac{15}{2+1}=5$$ daysÂ
so the answer is option A.
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