You are underway at 5 knots and see on your radar a contact 10 miles directly astern of you. 12 minutes later，the contact is 8 miles directly astern of you. What is the estimated speed of the contact? （）<br>A:Dead in the water<br>B:1 knot<br>C:10 knots<br>D:15 knots

You are underway at 5 knots and see on your radar a contact 10 miles directly astern of you. 12 minutes later，the contact is 8 miles directly astern of you. What is the estimated speed of the contact? （）
A:Dead in the water
B:1 knot
C:10 knots
D:15 knots

出自：海船船员证

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