A, B and C can do a work in 90, 45 and 6 days respectively. If they work together, in how many days will they complete the work?  Choose the correct answer.
A) 5	B) 6	C) 7	D) 8	E) 11
One days's work of A, B and C = 1/90 + 1/45 + 1/6   = (1 + 2 + 15)/90 = 1/5   A, B and C together can do the work in 5 days.   5nswer:5
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A, B and C can do a work in 90, 45 and 6 days respectively. If they work together, in how many days will they complete the work?