Asonar pulse is sent to the ocean bottom at 25°c, and it takes 1.20 s for the echo to come back. how deep is the bottom?

0.90 km 0.92 km 1.79 km 1.84 km

There are several information's of immense importance already given in the question. 
Velocity of sound = 1560 m/s
Time taken for the echo to reach surface = 1.20 second
We already know
Distance = Velocity * Time
               = 1560 * 1.20 meter
               = 1872 meter
So the total distance that the sound travels going down and up = 1872 meter
Then
The depth of the bottom = 1872/2 meter
                                       = 936 meter
                                       = 0.92 km
So the correct option is the second option.

Iwould sure like to answer your question but i honestly just don’t know

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