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ET
A remote-controlled submarine passed an ocean sunfish that was swimming at 85
centimeters per second. The submarine passed the fish while moving 9 centimeters to the
northeast at a constant velocity. It took the submarine 0.1 seconds to move that distance.
What was the submarine's velocity?

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see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west

i think it would be 5

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.