Each of A,B,C need a certain unique time to do a certain work.C needs 1hr less than A to complete the work.Working together they require 30min to complete 50percent of the job.The work also gets completed if A & B start working together and A leaves after 1hr and B works for further 3 hrs.How much work does C do per hour?
a)16.6%
b)33.3%
c)66.6%
d)50%