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MCAT Question A Day - 4/6/14

The depth of water in the ocean is determined by using sonar signals. Assuming that the speed of sound in water is about 1.5 km/s, and it takes a total of 6 s for a sonar signal to return to the ship after being emitted, what is the estimated depth of the ocean at that point?

A.  3.0 km
B.  9.0 km
C.  0.25 km