Question

sonic vibration were sent down from a ship return after 2 seconds. what is the depth of the sea if the speed of the sound in water is 1.5 km s-1
a)150m b) 3km c) 1.5 km d) 750 m


explain as well
the answwer shown is option c)
but is it so? 
and what is the formula? 

Answer 1

Speed=distace/time
Distace=speed × time

Distace =2d
Speed=1.5 km/s
Time=2 s
2d=1.5 km/s×2 s
2d=3km
D=1.5 km
Answer is c

Answer 2

Answer:

Speed=distace/time

Distace=speed × time

Distace =2d

Speed=1.5 km/s

Time=2 s

2d=1.5 km/s×2 s

2d=3km

D=1.5 km

Answer is c

Step-by-step explanation: