3.4× 5000000 =17000000 ㎝ =170km
2. A rectangular civic square is120m long and 70m wide. Draw it on the map with the scale of 1/2000. How many centimeters should I draw the length and width?
Length: 120÷2000=0.06m=6㎝,
Width: 70÷2000=3.5㎝.
3. On a map with the scale of 1: 1000, a rectangular playground is 1 1 cm long and 9 cm wide. What is the actual area of this rectangular playground?
Length:1/kloc-0 /×1000 =1000 ㎝ =10m,
Width: 9× 1000=9000㎝=90m,
Area = 1 10×90=9900 square meters.
4. Fence a rectangular vegetable garden with a circumference of 70 meters. What is the area of a vegetable garden with an aspect ratio of 4:3?
Length: 70 ÷ 2 ÷ (4+3) × 4 = 20m,
Width: 20 ÷ 4× 3 = 15m,
Area: 20× 15 = 300m2.
The distance between Party A and Party B is 600 kilometers. The fast and slow trains leave from both parties at the same time and meet after 2.5 hours. As we all know, the speed ratio of the express train to the local train is 5:3. How many kilometers per hour are the express train and the local train?
Sum of speed of two cars: 600÷2.5=240 km/h,
Express speed: 240 ÷ (5+3) × 5 = 150km/h,
Idle speed:150 ÷ 5× 3 = 90km/h.
6. The perimeters of the bottoms of the two cylinders are equal, and the ratio of the height of the first cylinder to the height of the second cylinder is 3:4. The volume of the first cylinder is 24 cubic decimeters. What is the volume of the second cylinder?
The perimeter of the bottom surface is equal and the area of the bottom surface is equal.
The ratio of volume is equal to the ratio of height.
Volume of the second cylinder: 24÷3×4=32 cubic decimeters.