Two Motorcycles Are Traveling in Opposite Directions at the Same

Multiple Choice

Two motorcycles are traveling in opposite directions at the same speed when one of the cyclists blasts his horn, which has frequency of 544 Hz. The other cyclist hears the frequency as 522 Hz. If the speed of sound in air is 344 m/s, what is the speed of the motorcycles?

A) 5.90 m/s
B) 7.24 m/s
C) 8.19 m/s
D) 10.0 m/s
E) 11.6 m/s