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Hi dear
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Suppose that the distance from enemy sub - marine = x
Then , The Total distance covered by wave in water = 2x
We know , Velocity = Distance / Time
ATQ ,
Velocity of sound wave × time = total distance covered by sound wave in water
1450 × 200 = 2x
x = 1450 × 200 / 2
= 1450 × 100
= 145000 m = 145 km
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