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A,B,C together can do a piece of work=8 hours
Work done by all in 1 hour =1/8
A can do a piece of work =20 hours
work done by A in 1 hour =1/20
B can do a piece of work =24 hours
work done by B in 1 hour=1/24
work done by C in 1 hour =1/8(1/20-1/24)
taking LCM we get the answer=1/30
so, C can do a piece of work in 30 hours
hope it helps......
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