MHB Why Do Vehicles Moving North-South Have East-West Velocity Components?

karush
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there are 5 more questions on this which are more complicated but want to get this (a) first. assume by speed they mean magnitude of the vector.

Toyundai speed is $$30 \frac{km}{h} $$

Chryssalt speed is $$\approx 39 \frac{km}{h}$$
 
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The arithmetic looks fine, but the question doesn't. Why do vehicles working north-south have east-west velocity components?
 

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