Question

Two trains are traveling on the same track and in the same direction. The first train, which is behind the second train, blows a horn whose frequency is 269 Hz. The second train detects a frequency of 290 Hz. If the speed of the second train is 13.7 m/s, what is the speed of the first train?

I used the following equation and set Fo to 290Hz and Fs to 269hz. + on top and - on bottom. I figured since the frequency observed by the second train is higher that it must be "approaching" the first train. IE, moving much slower than the first train. My answer came out very wrong. Am I setting this up properly?

Answer 1

DATE: DID V -Vo tu-vs २०- 267 343-13. उपर -V ) २१० (343 - V.) - २०१343 - 13.7) ११५ 70 - १२२67 = २१० -36853 Tus = 37.54 mis