There are six gears A, B, C, D, E and F in a compound train. The numbers of teeth in the gears are 20, 60, 30, 80, 25 and 75 respectively. The ratio of angular speeds of the driven (F) to the driver (A) of the drive is
A. $$\frac{1}{{24}}$$
B. $$\frac{1}{8}$$
C. $$\frac{4}{{15}}$$
D. 12
Answer: Option A
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The ratio of angular speed = (20*30*25)/(60*80*75).