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Arithmetic Aptitude :: Time and Work

4. A can do a work in 10 days and B can do the same work in 15 days. So how many days they will take to finish the same work ?

Answer: Option D

Explanation :

First find the 1 day work of both (A & B)
A 1 day's work = 1/10
and
B 1 day's work = 1/15

So (A + B) 1 day's work = (1/10+1/15)
= (3/30+2/30) = 5/30 = 1/6

So Both (A & B) together can finish work in 6 days

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