In this year's "Two Types of Small Citizens" competition, a student from our school was rated as an economical small citizen. He often turns off the faucet on his own initiative. If the inner diameter of the tap water pipe is 2cm, the flow rate in the water pipe is 8cm/second. Calculate how many liters of water he saved in 1 minute (reserve two decimal places).
在今年"两型小公民"评比中，我校某学生被评为节约型小公民，他常常主动关水龙头，如果自来水管内直径2cm，水管内流速是8cm/秒．算一算1分钟他节约了多少升水(保留两位小数)．
<result>1.5072</result>