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A can do a piece of work in 4 hours; B and C can do it in 3 hours. A and C can do it in 2 hours. How long will B alone take to do it ?
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Explanation:
If (A + C)’s one day work = 6 units
and A’s one day work = 3 units
then C’s one day work = 6-3 = 3 units.
(B + C)’s one day work = 4 units
then B’s one day work = 1 unit.
B can complete the whole work in
T.W\eff of B=12\1=12 hrs