In the compound gear train shown in the below Fig.72, gears \(A\) and \(C\) have equal numbers of teeth and gears \(B\) and \(D\) have equal numbers of teeth. When \(A\) rotates at \(800 \mathrm{rpm}, D\) rotates at \(200 \mathrm{rpm}\). The rotational speed of compound gears \(B C\) would then be

(a) \(300 \mathrm{rpm}\)

(b) \(400 \mathrm{rpm}\)

(c) \(500 \mathrm{rpm}\)

(d) \(600 \mathrm{rpm}\).

Transcribed Image Text:

B C ] [ I A D Fig.72