two men can do a piece of work in 6 hours and 4 hours respectively.the first man worked for 2 hours.he was then joined by the other .find the time taken by them to complete the work.
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two men can do a piece of work in 6 hours and 4 hours respectively.the first man worked for 2 hours.he was then joined by the other .find the time taken by them to complete the work.
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