Two workers A and B working together completed a job in 5 days. If A worked twice as efficiently as he actually did and B worked 1/3 as efficiantly as he actually did, the work would have been completed in 3 days. A alone could complete the work in?

• A. 5(1/4) days
• B. 7(1/2) days
• C. 6(1/4) days
• D. 12 days