Frame S' Moves in the Positive X Direction at 0

Multiple Choice

Frame S' moves in the positive x direction at 0.6c with respect to frame S.A particle moves in the positive x direction at 0.4c as measured by an observer in S'.The speed of the particle as measured by an observer in S is:

A) c/5
B) 5c/19
C) 8c/25
D) 25c/31
E) c