Maths Time and Work Question for SSC CGL and SSC CPO

Question:

A and B can do a work in 12 days ,B and C in 15 days and C and A in 20 days. If A ,B , C work together, they will complete the work in :

[This Question asked in following exams-

·       SSC CGL 1999

·       SSC CGL 2006

·       SSC CGL 2013

·       SSC CPO 2003

·       SSC CPO 2006]

Options:

(1)5 days

(2)7(5/6) days

(3)10 days

(4)15 2/3 days

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