If 'A' completes a piece of work in 3 days, which 'B' completes it in 5 days and 'C' takes 10 days to complete the same work. How long will they take to complete the work , if they work together?  Choose the correct choice from the following choices
A) 1.5 days	B) 4.5 days	C) 7 days	D) 9.8 days	E) 9 days
EXPLANATION:   Hint:   A's one day work =	1/3   B's one day work =	1/5   C's one day work =	1/10   (A+ B+ C)'s one day work =	1/3	+	1/5	+	1/10	=	1/1.5   Hence, A ,B &amp; C together will take 1.5 days to complete the work.   1.5 daysNSWER IS 1.5 days
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If 'A' completes a piece of work in 3 days, which 'B' completes it in 5 days and 'C' takes 10 days to complete the same work. How long will they take to complete the work , if they work together?