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As a ship approaches a cliff,its siren is sounded and the echo is heard in...

As a ship approaches a cliff,its siren is sounded and the echo is heard in the ship after 12secs.2.1 minutes later the siren was sounded again and the echo was heard 8secs later.if the speed in air is 340m/s.calculate the velocity at which the ship was approaching the cliff?
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