The following are the data for two crossed helical gears used for speed reduction:

Gear I : Pitch circle diameter in the plane of rotation $80 \mathrm{~mm}$ and helix angle $30^{\circ}$ Gear II : Pitch circle diameter in the plane of rotation $120 \mathrm{~mm}$ and helix angle $22.5^{\circ}$ If the input speed is $1440 \mathrm{rpm}$, the output speed in $\mathrm{rpm}$ is

(A) 1200

(B) 900

(C) 875

(D) 720

The following are the data for two crossed helical gears used for speed reduction:

Gear I : Pitch circle diameter in the plane of rotation $80 \mathrm{~mm}$ and helix angle $30^{\circ}$ Gear II : Pitch circle diameter in the plane of rotation $120 \mathrm{~mm}$ and helix angle $22.5^{\circ}$ If the input speed is $1440 \mathrm{rpm}$, the output speed in $\mathrm{rpm}$ is

(A) 1200

(B) 900

(C) 875

(D) 720

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