Calculating Beats in a Room with Multiple Speakers and Moving Student

[DDS]

A speaker at the front of a room and an identical speaker at the rear of the room are being driven by the same oscillator at 464 Hz. A student walks at a uniform rate of 1.67 m/s along the length of the room. How many beats does the student hear per second?

I have gotten this far its just i don't know where to go from here..simply i don't no how to find v, is it just speed of sound ??

F=464 Hz
u=1.67 m/s

Flow=f(1-u/v)
Fhi= f(1+u/v)

Fbeat=/ Fhi - Flow / = (2*f*u)/v

Whats v??

 

[DDS]

does anyone know how to determine the value of v

 

[DDS]

nvm i got it