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1) A man who is 2 m tall is walking straight away from a lamppost at a rate of 8 km/h. The lamppost is 7 m high. How fast is the end of his shadow moving when he is 7 m from the foot of the lamppost? Ans: 11.2 km/h

I know that you have to use the property of similiar triangles but I'm not too sure how to set it up. Any suggestions?

2) Two ships start out from harbour at the same time; one travels northeast and the other southeast. If the first has a speed of 16 kn and the second 12 kn, how fast are they separating after 1 h? Ans: 20 kn

Would it help to know what kn stood for? Because I have no idea. Anyways, I started out with a coordinate grid with the harbour at (0,0) and the first ship at (x,16) and the second ship at (x,-12). Don't really know if this is the right to approach this but I had to start with something. Thanks, and have a good night.