Direction: Read the following information carefully and answer the questions that follow.

There are four friends Rita, Gita, Mita and Sita. Time taken by Rita to complete the work alone is 14 days more than the time taken by Sita to complete the work alone. Sita start working and Gita joined sita after 11 days. Both works together and after 15 days they left and the remaining work is completed by Mita in 10 more days. The ratio of efficiency of Gita to Rita is 4 ∶ 5 and the ratio of the efficiency of Gita to Mita is 6 : 7.