每个单词都认识,how many minutes willit take to completely fill a water tank with a capacity of 3.750cubic feet if the water is being pumped into the tank at the rate of 800 cubic feet per minute and is being drained out of the tank at the rate
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每个单词都认识,how many minutes willit take to completely fill a water tank with a capacity of 3.750cubic feet if the water is being pumped into the tank at the rate of 800 cubic feet per minute and is being drained out of the tank at the rate
每个单词都认识,
how many minutes willit take to completely fill a water tank with a capacity of 3.750cubic feet if the water is being pumped into the tank at the rate of 800 cubic feet per minute and is being drained out of the tank at the rate of 300cubic feet per minute
每个单词都认识,how many minutes willit take to completely fill a water tank with a capacity of 3.750cubic feet if the water is being pumped into the tank at the rate of 800 cubic feet per minute and is being drained out of the tank at the rate
楼主,这个3.750应该是3,750=3750吧?
整个题目的意思是：
一容积为3750立方英尺的水池,现在打开注水阀以800立方英尺/分的速度注水,同时,打开放水阀以300立方英尺/分的速度放水,问：需要多长时间才能把水池注满?
设需要x分钟
800X-300X=3750
X=7.5