A complete 710710 of a work in 15 days, then he completed the remaining work with the help of B in 4 days. In how many day A and B can complete entire work together?

• A. 1012 days1012 days1012 days1012 days1012 days1012 days1012 days1012 days1012121122 days days days1012 days
• B. 1223 days1223 days1223 days1223 days1223 days1223 days1223 days1223 days1223232233 days days days1223 days
• C. 1313 days1313 days1313 days1313 days1313 days1313 days1313 days1313 days1313131133 days days days1313 days
• D. 814 days814 days814 days814 days814 days814 days814 days814 days814141144 days days days814 days