A will complete whole work in 9 × 8/3 = 24 days B will complete whole work in 8 × 9/4 = 18 days C will complete whole work in 8 × 3/2 = 12 days Let total amount of work = 72 units (LCM of 24, 18 and 12) Efficiency of A, B and C is 3, 4 and 6 respectively 65% of total work = 72 × 0.65 units Desired time taken = (72 × 0.65)/13 = 72 × 0.05 = 3.6 days Hence, option a.
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