The inner diameter of the water pipe is 2 cm, and the flow rate of water in the pipe is 8 cm/s. If a student turns on the tap to wash his hands and forgets to turn off the tap, how much water will be wasted in 4 minutes?
自来水管的内直径是2厘米，管内水的流速是8厘米/秒，一位同学打开水龙头洗手忘了关水龙头，4分钟会浪费多少升水．
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