Question: A certain dog whistle operates at 2 2 . 8 kHz , while another ( brand X ) operates at an unknown frequency. If humans

A certain dog whistle operates at 22.8 kHz , while another (brand X) operates at an unknown frequency. If humans can hear neither whistle when played separately, but a shrill whine of frequency 5600 Hz occurs when they are played simultaneously, estimate the operating frequency of brand X.

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