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Two ships are moving along a line due east. The trailing vessel has a speed of 16 km/h relative to a land-based observation point, and the leading ship has a speed of 59.5 km/h relative to the same station. The trailing ship transmits a sonar signal at a frequency of 1140 Hz. What frequency is monitored by the leading ship? Use 1410 m/s as the speed of sound in ocean water.

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