During the course of the three-hour tour, a boat sails 25 km north across a lake. The wind and currents carry the boat 5 km west.
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Total distance travelled by the ultrasonic waves=velocity of the ultrasonic waves*Total time taken by the ultrasonic waves
Therefore,
2*Depth of the sea=1400m/s*1.6s
Depth of sea=1120m
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