A space station consists of two donut-shaped living chambers, A and B that have the radii shown

Question:

A space station consists of two donut-shaped living chambers, A and B that have the radii shown in the drawing. As the station rotates, an astronaut in chamber A is moved 2.40 × 102 m along a circular arc. How far along a circular arc is an astronaut in chamber B moved during the same time?