Question

One whale says something to its friend 75 km away.How long will it be before the friend can hear it?

Answer 1

Answer:

50 seconds

Explanation:

Given:

Distance between the 2 whales (d) = 75 km = 75,000 m

Speed of sound in water (s) = 1500 m/s (approx.)

To find:

Time taken for the 2nd whale to hear the sound (t)

Method to find:

t = d/s  (Time = Distance/Speed)

⇒ t = 75000/1500

⇒ t = 50 seconds

Hence, it will be 50 seconds before the friend can hear the sound.

Answer 2

Answer:

Van wale says something to it sends 75 km away how long will it before the friend can hear it the speed of sound in water is 15 m/s