At the same time and at the same place, the shadow of a 1-meter-long pole is 0.6 meters long. A repairman wants to climb to the 48-meter-high TV tower to repair equipment. His crawling speed in the vertical direction is 0.4 m/s. What is the speed of the shadow in meters per second?
同时同地，一根长1米的标杆的影长0.6米，一名修理工要爬至48米高的电视塔上修理设备，他竖直方向爬行的速度为0.4米/秒，则此人的影子移动的速度为多少米/秒．
<gadget id="calculator">0.6 * 0.4</gadget>
<output>0.24</output>

<result>0.24</result>