A camel at the base of a large sand dune wants to get to the top of it to see what is on the other side.
The dune distance d and height h are as shown below:
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................| h
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Camel ----------------------------+
d
Steep dunes don't worry him because this is a smart camel!
When the slope is > 30 degrees, then instead of going straight up he will zig-zag back and forth so the climb is not so steep.
Given d and h then what is the shortest amount of walking for our smart camel to get to the top of the sand dune?