Pankaj can finish a work in 30 days and Naresh can do the same work in half the time taken by Pankaj. Then, working together, what part of the same work they can finish in a day ?
Solution: Pankaj's 1 day's work = 1/30 and Naresh's 1 day's work = 1/15.
.'. (Pankaj+Naresh)'s 1 day's work = (1/30 + 1/15) = 3/30 = 1/10.
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