Dong Dong rides a bicycle uphill at a speed of 2 m/s. The speed of the downhill is 6 m/s. It is known that Dongdong took 4 minutes to ride uphill and then downhill. So how long is the slope in meters?
冬冬骑自行车上坡的速度是2米/秒．下坡的速度是6米/秒．已知冬冬骑上坡再骑下坡共用了4分钟．那么坡长为多少米？
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">2 * 60 * 4 * (3/4)</gadget>
<output>360</output>

<result>360</result>