Question

An iceberg is 3,000 metres from a submarine. The submarine emits ultrasound. How long until the submarine detects the iceberg?

Answer 1

Step-by-step explanation:

t= d/s

t = 3000/330

t=9.09*2

t=18.18s

The submarine detects the iceberg in 18.18s

Answer 2

3.92s
Ultrasound works by the waves traveling to the object, bouncing off, then returning. So the distance traveled is twice that of the actual distance.
Therefore d=6,000m
d= speed x time
Speed of sound in water is about 1,530.
6000 = 1530 * t
t = 3.92s