Answer :


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


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

= 1450×38.5 m

= 55.8 km

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