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Ocean waves are traveling to the east at 3.2 m/s with a distance of 22m between crests.

a) With what frequency do the waves hit the front of the boat when the boat is at anchor? ** 3.2/22=.1455 Hz, which I got right.

b) With what frequency do the waves hit the front of a boat when the boat is moving westward at 1.4m/s?

Now, b/c they are moving towards each other, I substrated 1.4 from 3.2 and I got 1.8. I then got 1.8/22=0.0818, which is incorrect.

What am I doing wrong with regard to the second part?