Plane sound echo
A plane flying at 612 km/h speed sent a sound signal. In front of the aircraft (in the direction of flight), there is a fixed object at a distance of 3 km, from which the sound is reflected back to the plane. How long will it take the pilot to hear the echo of this sound? The speed of sound propagation is 340 m/s. (answer rounded to 2 decimal places)
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