What Are the Possible Frequencies of the Second Xylophone Bar?

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Homework Statement

A xylophone has a set of vibrating bars. A bar with a frequency of 343 Hz is struck. A very short time later, a second bar is also sounded, and one hears the volume of the xylophone increase and decrease 5 times each second (called beats). What are the possible frequencies of the second bar (in Hz)? Determine if the following frequencies is correct or incorrect.
A. 353
B. 338
C. 333
D. 348
E. 349

Homework Equations

The Attempt at a Solution

How do I figure this out?
A.
B.
C.
D.
E.

 

[BuBbLeS01]

Nevermind I got it..a lot easier then I was making it hehe.