Three workers Sachin, Saurav and Rahul are appointed to do a job. They together started the job but Rahul left after 4 days at that time 46% of the work was completed. The remaining job was completed by Sachin and Saurav in 6 days. The ratio of efficiency of Sachin and Saurav is 5 : 4. Find the number of days required by the slowest worker to complete the entire job alone?