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

A a ship approaches a cliff, its siren is sounded and the echo is heard in the ship after 12 seconds. 2.1 minutes later the siren was sounded again and the echo was heard 8 seconds later. if the speed in air is 340 ms-1, calculate the velocity at which the ship was approaching the cliff.?

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