It takes 2 hours for a motorcycle to travel 40 kilometers on top of the wind, and the wind speed is 2 kilometers per hour. How many kilometers per hour will the motorcycle travel with the wind?
一摩托车顶风行40千米用了2小时，风速为每小时2千米，则这辆摩托车顺风行驶时每小时行多少千米？
<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">20 + 4</gadget>
<output>24</output>

<result>24</result>