题目

Modem life is impossible without travel. The fastest way of travel is by plane. With a modern you can travel in one day to places, which it took a month or more to get to a hundred year ago. Travel by train is slower than by plane, but it has its advantages. You can see the country you are traveling through .Modern trains have comfortable seats and dining cars. They make even a longest journey enjoyable. Some people prefer to travel by sea when possible. There are large liners and river boats. You can visit many other countries and different places. Ships are not so fast as trains or planes, b（xc13?广州模拟）A和B都是高度为1c厘米的圆柱形容器（如图所示），底面半径分别为1厘米和x厘米．一水龙头单独向A注水，用1分钟可以注满．现在两下容器在它们高度一半处用一下细管连通（连通管子的容积忽略不计），仍用该龙头向A注水．问：（1）x分钟时，容器A中的高度是多2？（x）3分钟时，容器A中水的高度是多2？