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# Vectors intro

## Problem

A boat is traveling at a speed of 50 kilometers per hour, in a direction that is 45, degree to the west from the northward direction.
Here are a few vectors, where vertical bar, vertical bar, a, with, vector, on top, vertical bar, vertical bar, equals, vertical bar, vertical bar, b, with, vector, on top, vertical bar, vertical bar, equals, vertical bar, vertical bar, c, with, vector, on top, vertical bar, vertical bar, equals, vertical bar, vertical bar, d, with, vector, on top, vertical bar, vertical bar, equals, 50, start fraction, start text, k, m, end text, divided by, start text, h, end text, end fraction:
Which vectors can represent the boat's velocity?