A bat (at rest) uses high frequency sound waves to "see." Assume the sound waves have frequency of 40,000Hz and move with a speed of 343m/s in air. The wavelength of sound is 8.6mm. The bat "sees" an insect by detecting it with its sound waves. If the sound takes .3 s total time to travel to the insect and then return to the bat after they bounce off the insect so it is 51.5 m away. The insect is moving away from the bat because the returned frequency is 39,000hz. HOW FAST IS THIS INSECT MOVING?