Question

A can do a piece of work in 4 hours, B and C together can do it in 3 hours, while A and C together can
do it in 2 hours. How long will B alone take to do it?
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Answer 1

Step-by-step explanation:

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A's 1 hour work= 1/4

(B+C)'s 1 hour work=1/3

(A+C)'s 1 hour work=1/2

C's 1 hour work=1/2-1/4=1/12

Hence, B will complete the whole work in 12 days.