A can have a piece of work done in 8 days, B can work three times faster than the A, C can work five times faster than A. How many days will they take to do the work together ?	Answers:	A) 3 days	B) 8/9 days	C) 4 days	D) can't say	E) none
A's 1 day work is 1/8   8/9 days's 1 day work is 3/8   C's 1 day work is 5/8   (A+8/9 days+C)'s 1 day work(1/8+3/8+5/8) is 9/8   so, they can finish the work in 8/9 days   ANSWER:8/9 days
<result>B</result>
A can have a piece of work done in 8 days, B can work three times faster than the A, C can work five times faster than A. How many days will they take to do the work together ?