Dolphins use ultrasound to locate obstacles and prey in murky water. A dolphin is chasing a squid. If the dolphin swims at 39 km/h while emitting a sound at a frequency of 135.0 kHZ, and receives an echo at a frequency of 135.5 kHz, what is the relative speed of the dolphin with respect to squid? Is the dolphin moving toward or away from the squid? The speed of sound in the sea is 1560 m/s.
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