if ramesh suresh and harish can do a piece of work..., Time & Work, General Mathematics

Question:If Ramesh,  Suresh and Harish can do a piece of work in 15 days, 10 days and 6 days respectively, how long will they take to do it, if all the three work at it together ?

A 3 days 
B `3 1/2` days 
C `3 9/20` days 
D `3 3/20` days

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+ AnswerA

+ Explanationsolution:
(Ramesh + Suresh + Harish)'s 1 day's work = `(1/15 + 1/10 + 1/6)`
                                                                      =`12/30`
                                                                      =`1/3`.
So, all the tree will finish the work in 3 days.

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