A does a work in 10 days and b does the same work In 15 days In how many days they together will do the same work?

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RRB Junior Clerk Exam (Allahabad) 2009 click here to view all questions

A does a work in 10 days and b does the same work In 15 days In how many days they together will do the same work?

A5 days

B6 days

C8 days

D10 days

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Corrct Answer: B [6 days] Explanation: $\text{A's one day work =}\frac{1}{10}$ $\text{B's one day work = }\frac{1}{15}$ $\text{(A+B)'s one day's work }$ $=\frac{1}{10} + \frac{1}{15}$ $=\frac{3+2}{30}$ $=\frac{1}{6}$ $\therefore \text{A and B together work in 6 days. }$ Nithin K ? answered Apr 21 '2018 at 16:18 All Comments

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