Two Golf Carts Have Horns That Emit Sound with a Frequency

Multiple Choice

Two golf carts have horns that emit sound with a frequency of 394 Hz. The golf carts are traveling toward one another, each traveling with a speed of 9.5 m/s with respect to the ground. If one of the drivers sounds her horn, what frequency does the other driver hear? The speed of sound at the golf course is 345 m/s.

A) 378 Hz
B) 394 Hz
C) 408 Hz
D) 416 Hz
E) 424 Hz