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Two workers A and B working together com...

Two workers A and B working together completed a job in 5 days. If A worked twice as efficient, as he actually did and B worked `1/3` as efficiently as he actually did, the work would have been completed in 3 days. A alone could complete the work in `5 1/4\ d a y s` b. `6 1/4\ \ d a y s` c. `7 1/2d a y s` d. none of these

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