Solution,
1)
Velocity, v1 = 113 km/h = 31.39 m/s
Velocity, v2 = 59 km/h = 16.39 m/s
Frequency, f' = f (u + v1) /(u - v2) = 500(340 + 31.39)/(340 - 16.39) = 573.82 Hz
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