A, B and C can do a job in 6 days, 12 days and 15 days respectively. After 1/8 of the work is completed, C leaves the job. Rest of the work is done by A and B together, Time taken to finish the remaning work is:
(a) 35/6 days
(b) 21/4 days
(c) 7/2 days
(d) 15/3 days
