Question

6.a submarine produces sound that is detected by another submarine which 45km away. how much time sound is taking to reach another submarine? (the speed of sound in water is 1500m/s)
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Answer 1

Given:

A submarine produces sound that is detected by another submarine which 45km away.

To find:

Time taken by sound to reach another submarine?

Solution:

Time taken by sound to reach another submarine can be easily calculated by dividing the distance travelled by sound with the speed of sound in water.

$\therefore \: time = \dfrac{distance}{speed}$

$\implies \: time = \dfrac{45 \: km}{1500 \: \: m/s}$

$\implies \: time = \dfrac{45000\: m}{1500 \: \: m/s}$

$\implies \: time = 30 \: sec$

So, time taken by sound to reach the other submarine is 30 seconds.