Time ratio of A, B and C = 15 : 30 : 75 As we know, Efficiency ratio is inversely proportion to time. Efficiency ratio of A, B and C = 1/15 : 1/30 : 1/75 or 150/15 : 150/30 : 150/75 or 10 : 5 : 2 Efficiency ratio of A, B and C = 10x : 5x : 2x According to the question 10x + 5x + 2x = 1615 ⇒ 17x = 1615 ⇒ x = 1615/17 ⇒ x = 95 The difference between share A and C = 10x – 2x = 8x = 8 × 95 = 760