A woman walks due west on the deck of a ship at $6 \mathrm { mi } / \mathrm { h }$. The ship is moving north at a speed of $21 \mathrm { mi } / \mathrm { h }$. Find the speed of the woman relative to the surface of the water. Round the result to the nearest tenth.

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The Answer of A woman walks due west on the deck of a ship at $6 \mathrm { mi } / \mathrm { h }$. The ship is moving north at a speed of $21 \mathrm { mi } / \mathrm { h }$. Find the speed of the woman relative to the surface of the water. Round the result to the nearest tenth.

A Woman Walks Due West on the Deck of a Ship