Xiaohong needs to walk 5 kilometers to go to the zoo. She has already walked 2.38 kilometers. How many kilometers do she have to walk?
小红去动物园，需要走5千米的路程，已经走了2.38千米，还要走多少千米？
<gadget id="calculator">5 - 2.38</gadget>
<output>2.62</output>

<result>2.62</result>