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A men can do a piece of work in 5 days. With the help of his friend, he can do the same work in 3 days. In how many days can his friend complete the work ?
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- 6 days
- 61/2 days
- 7 days
- 71/2
- None of the above
Correct Option: D
(Man and his friend)'s 1 day's work = 1/3
Men's 1 day's work = 1/5
His friend's 1 day's work is = 1/3 - 1/5 = 2/15
Hence, his friend can complete the work in 15/2 = 71/2
