Assume That the Cities Lie on the Same North-South Line $50 ^ { \circ }$

Multiple Choice

Assume that the cities lie on the same north-south line and that the radius of the earth is 6400 km.
-A pulley rotates through $50 ^ { \circ }$ in one minute. How many rotations (to the nearest tenth of a rotation) does the pulley make in an hour?

A) $16.7$ rotations
B) $150.0$ rotations
C) $8.3$ rotations
D) $300.0$ rotations