2. It is 7.2 kilometers from the foot of the mountain to the top of the mountain. It took Xiaoming three hours to go up the mountain and two hours to go down the mountain. How fast is it to go down the mountain?

3. Grandma Wang saved 34.5 yuan in the first half of the year and 2 1 yuan in the second quarter. Who saves more water on average every month? How much more?

4. 10000 square meters of forest can absorb 6.3 tons of carbon dioxide every week. There are 50,000 square meters of forest now. How many tons of carbon dioxide can * * * absorb in February 2008?

My mother is 36 years old, five times younger than Xiaoming. How old is Xiaoming?

6. The earth's orbit around the sun is 365 days, which is four times longer than that of Mercury's orbit around the sun 13. How many days does mercury go around the sun?

7. Each carton can hold15kg of fruit at most. There are 680 kilograms of fruit now. How many boxes do you want?

8. It is 7.2 kilometers from the foot of the mountain to the top of the mountain. Xiaoming spent three hours climbing the mountain and two hours going down the mountain. What is his average speed?

9. There is a 25-meter-long packaging tape, and each package of a gift box needs 1.5 meters, and at most several gift boxes can be packaged.

10. The Forbidden City covers an area of 720,000 square meters, less than Tiananmen Square160,000 square meters. What is the area of Tiananmen Square?