Aflutist assembles her flute in a room where the speed of sound is 342 m/s. when she plays the note a, it is in perfect tune with a 440 hz tuning fork. after a few minutes, the air inside her flute has warmed to where the speed of sound is 346 m/s.

-got a: how many beats per second will she hear if she now plays the note a as the tuning fork is sounded? 5.15 beats/s

-now gotta find b:
how far does she need to extend the "tuning joint" of her flute to be in tune with the tuning fork? (answer is d=)