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sarthaktuli
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a can do a piece of work in 12 hours, b in 6 hours, c in 4 hours. a does the work for 2 hours and then b and c join. how much time does it take for a alone to finish the work?

Can some one pls answer this question?
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Work Rate and Time 05 Jul 2016, 20:41
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sarthaktuli
a can do a piece of work in 12 hours, b in 6 hours, c in 4 hours. a does the work for 2 hours and then b and c join. how much time does it take for a alone to finish the work?

Can some one pls answer this question?
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Could you revise your question? The question "how much time does it take for A alone to finish work" doesn't seem right considering the type of information given. I guess the question should be "how much time does it take for the work to finish?"
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sarthaktuli
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The question is how much time does it take for a alone to finish the remaining work?
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AmoyV
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Work Rate and Time 05 Jul 2016, 20:48
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sarthaktuli
The question is how much time does it take for a alone to finish the remaining work?
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How much time do B and C work on the work? We can't calculate the answer till we are able to deduct the amount of work B and C did from the total work.
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sarthaktuli
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How much time do B and C work on the work? We can't calculate the answer till we are able to deduct the amount of work B and C did from the total work.[/quote]

So basically calculate the amount of time a,b and c can do the remaining work in. Then my question is if a alone were to do that remaining work, how much time would it take a then?
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sarthaktuli
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So basically calculate the amount of time a,b and c can do the remaining work in. Then my question is if a alone were to do that remaining work, how much time would it take a then?
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We don't need to make any calculations then. The answer is 12 hours.

For more information refer to the below pasted post:

work-word-problems-made-easy-87357.html

Also, I think you would find this book helpful:
gmat-math-book-in-downloadable-pdf-format-130609.html
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Are you sure the question isn't asking something along the lines of "A works for two hours. Then B and C join. How long does it take A, B, AND C to complete the job?"
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