A, B and C make 940 parts at the same time. It takes 5 minutes for a part to be made by a, B and C, which is 25% more than that of B. the time for C to make a part is two fifths less than that of A. how many parts does a, B and C make?

A, B and C make 940 parts at the same time. It takes 5 minutes for a part to be made by a, B and C, which is 25% more than that of B. the time for C to make a part is two fifths less than that of A. how many parts does a, B and C make?

Let a use time x B use time = x / (1 + 25%) = (4 / 5) x min C use time = x * (1-2 / 5) = (3 / 5) x min a = 1 / x B = 1 / (4 / 5) x C = 1 / 3 / 5) x A: B: C = 12:15:2012 + 15 + 20 = 47 A = 940 * 12 / 47 = 240 B = 940 * 15 / 47 = 300 C = 940 * 20 / 47 = 400