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A boat moves from a jetty to wards East....

A boat moves from a jetty to wards East. After sailing for 9 nautical miles, she turns towards right and covers another 12 nautical miles. If she wants to go back to the jetty what is the shortest distance now from her present position?

A

21 nautical miles

B

20 nautical miles

C

18 nautical miles

D

15 nautical miles

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