Question

here is your question in the attachment ​

Answer 1

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

Answer 2

➡️Here is your answer

S =

$\frac{v \times t}{2} = \frac{1.450}{2} = 145km$