Answer :

Given,


Speed of sound in water = 1450 m/s


Total time taken for transmission = 77 s


Let distance between our submarine and enemy submarine be, D.


Time taken to travel the distance D be, t = 0.5×77 = 38.5 s


Thus,


D = Speed of sound in water × Time taken to travel the distance D


= 1450×38.5 m


= 55.8 km


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