There is a rectangle with a width of 120 cm and a perimeter of 960 cm, what is the length of the rectangle in cm?
有一个宽为120厘米的长方形，它的周长为960厘米，这个长方形的长是多少厘米？
<gadget id="calculator">960 / 2</gadget>
<output>480</output>

<gadget id="calculator">480 - 120</gadget>
<output>360</output>

<result>360</result>