19. A Navy ship sends a pulse of ultrasound and receives an echo three seconds later from a submarine hiding at the bottom of the ocean C to S and the ship at B receives an echo four seconds from B to S . Discover the location of the submarine with respect to the ship at \( A \) and its depth ( \( B \) to \( S \) ) in the ocean.
a. \( 4,500 \mathrm{~m}, 2000 \mathrm{~m} \)
b. \( 2,250 \mathrm{~m}, 6240 \mathrm{ft} \)
c. \( \quad 375.0 \mathrm{~m}, 1,240 \mathrm{ft} \)
d. \( 1,200 \mathrm{~m}, 8,840 \mathrm{ft} \)
e. \( 3,875 \mathrm{~m}, 10,168 \mathrm{ft} \).
The speed of sound in sea water is about \( 1550 \mathrm{~m} / \mathrm{s} \)