John can complete a given task in 16 days. Jane will take only 12 days to complete the same task. John and Jane set out to complete the task by beginning to work together. However, Jane was indisposed 5 days before the work got over. In how many days did the work get over from the time John and Jane started to work on it together?  Pick
A) 62 B) 64 C) 66 / 7 D) 10 E) 68 / 7

Rationale: "in such questions , you need to start from the end . last 5 days john works alone and completes 5 * ( 1 / 16 ) = 5 / 16 of the work . so 11 / 16 of the work should have been completed by the two of them together before jane left . their combined rate of work is 1 / 16 + 1 / 12 = 7 / 48 time taken to complete 11 / 16 of the work = ( 11 / 16 ) / ( 7 / 48 ) = 33 / 7 days . so total number of days taken to complete the work = 33 / 7 + 5 = 68 / 7 days . e"
Answer: E