The World Expo Axis is the main axis of the space landscape and human traffic in the Shanghai World Expo Park. It took Xiao Ming 21 minutes to walk from the south end of the Expo Axis to the north end. He takes about 75 steps per minute, and each step walks 0.64 meters. How many meters is the total length of the Expo Axis from north to south?
世博轴是上海世博园区空间景观和人流交通的主轴线．小明从世博轴的南端步行到北端，共花了21分钟．他每分钟大约75步，每步走0.64米．世博轴南北全长约多少米？
<gadget id="calculator">0.64 * 75 * 21</gadget>
<output>1_008</output>

<result>1_008</result>