The flywheel of a hand operated chaff cutter with two cutting knives is rotated at $30 \mathrm{rpm}$ and is connected to a worm gear assembly for driving the feed rollers. The number of teeth of the worm gear is 24 and number of starts (threads) of the worm is 2. If diameter of each of the feed rollers is $15 \mathrm{~cm}$, the chaff length in mm will be
(A) 9.8
(B) 12.8
(C) 19.6
(D) 39.2
The flywheel of a hand operated chaff cutter with two cutting knives is rotated at $30 \mathrm{rpm}$ and is connected to a worm gear assembly for driving the feed rollers. The number of teeth of the worm gear is 24 and number of starts (threads) of the worm is 2. If diameter of each of the feed rollers is $15 \mathrm{~cm}$, the chaff length in mm will be
(A) 9.8
(B) 12.8
(C) 19.6
(D) 39.2