Two airplanes, one flying due east and the other due west, are on a near collision course

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Two airplanes, one flying due east and the other due west, are on a near collision course separated by 15 km when the pilot of one plane, traveling at 900 km/h, observes the other on his Doppler radar. The radar unit emits electromagnetic waves of frequency 3 x 1010 Hz. The radar readout indicates that the other plane's speed is 750 km/h. Determine the frequency of the signal received by the pilot's radar.

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