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James Bond is riding a bike at 15 m/s, chasing Car #1 moving in the same direction at 35 m/s. Behind James is another car, Car 2, chasing him at 20 m/s. Both cars have horns blaring at a frequency of 390 Hz. Assume a sound speed of 340 m/s.

a. What frequency does James hear from Car 1?

b. From Car 2?

c. What is the beat frequency he hears?

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