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Question: 

The predominant frequency of a certain fire truck’s siren is 1650 Hz when at rest. What frequency do you detect if you move with a speed of 30.0 m/s

  1. toward the fire truck, and
  2. away from it?

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 
  1. $1790 \textrm{ Hz}$
  2. $1510 \textrm{ Hz}$

Giancoli 7th Edition, Chapter 12, Problem 56

(1:12)