1. The construction workers need 4800 square bricks for paving the street square. If they use 80cm square bricks instead, how many are needed? 2. A train leaves Wuhan for Nanjing at 6:30 a.m. and runs 120 kilometers per hour. Can it arrive at 10:30 a.m. (the distance on the map is 2cm, and the scale is 1:9000000) 3. There are two containers. First fill the cone with radius of 5cm and height of 10cm with water, and then pour it into the cylinder with radius of 4cm and height of 10cm. What is the depth of water in the cylinder?

1. The construction workers need 4800 square bricks for paving the street square. If they use 80cm square bricks instead, how many are needed? 2. A train leaves Wuhan for Nanjing at 6:30 a.m. and runs 120 kilometers per hour. Can it arrive at 10:30 a.m. (the distance on the map is 2cm, and the scale is 1:9000000) 3. There are two containers. First fill the cone with radius of 5cm and height of 10cm with water, and then pour it into the cylinder with radius of 4cm and height of 10cm. What is the depth of water in the cylinder?

1.4800*0.81/0.8*0.8=6075
2. The actual distance is 180km. The speed of the train is 120km per hour, and it will arrive in four hours
3. The volume of cone is 1 / 3 π * 5 * 5 * 10 = 250 π / 3, and the volume of water in cylindrical container should also be 250 π / 3. Therefore, 250 π / 3 = 4 * 4 * h * π H = 125 / 24 cm is about 5.2 cm
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