A rectangular swimming pool is 25 meters long and 15 meters wide. Grandpa walked 5 times around the swimming pool. How many meters did he walk in total?
一个长25米，宽15米的长方形游泳池，爷爷绕着游泳池走了5圈，一共走了多少米？
<gadget id="calculator">25 + 15</gadget>
<output>40</output>

<gadget id="calculator">40 * 2 * 5</gadget>
<output>400</output>

<result>400</result>