Xiao Ming rides a bicycle from A to B, first uphill and then downhill. After arriving at B, immediately go back the same way and take 34 minutes. It is known that the uphill speed is 400 m/min and the downhill speed is 450 m/min, how many meters are the distance between A and B? (Please write the equation to solve this question)
小明骑自行车从甲地到乙地，先上坡后下坡．到达乙地后马上原路返回，共用34分钟．已知上坡的速度是400米/分，下坡的速度是450米/分，则甲、乙两地相距多少米？(请列方程解答此题)
<gadget id="calculator">34 * 450</gadget>
<output>15_300</output>

<gadget id="calculator">400 + 450</gadget>
<output>850</output>

<gadget id="calculator">15_300 / 850</gadget>
<output>18</output>

<gadget id="calculator">18 * 400</gadget>
<output>7_200</output>

<result>7_200</result>