The perimeter of the school's rectangular playground is 560m, and the length is the width (5/2). How many meters is the playground?
学校长方形操场的周长是560m，长是宽的(5/2)，操场的长是多少米？
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">280 / (5/7)</gadget>
<output>392</output>

<result>392</result>