1. The problem statement, all variables and given/known data A bat moving at 4.5 m/s is chasing a flying insect insect. The bat emits a 52 kHz chirp and receives back an echo at 52.75 kHz. At what speed is the bat gaining on its prey? Take the speed of sound in air to be 342 m/s. 2. Relevant equations f1 = f ((velocity +/- velocity observer)/(velocity +/- velocity source)) 3. The attempt at a solution To start off, I converted 52 kHz to 52,000 Hz and 52.75 kHz Then my equation looked like: 52750 = 52000 ((342 - vo)/(342-4.5) I found vo to be .367788 and subtracted that from 4.5 to find the speed gained, but that doesn't seem to work. Can anyone help?