2. A rectangle is 2 1 cm long and three times as wide. What is the circumference and area of this rectangle?
The rectangular playground is 50m long and 40m wide. After the expansion, the length and width increased by 5 meters respectively. How many square meters has the playground area increased after the expansion?
A train travels 366 kilometers in 6 hours in the morning and 276 kilometers in 4 hours in the afternoon. How many kilometers more in the afternoon than in the morning?
5. A factory uses coal 120 tons in the first half of the year and coal 102 tons in the second half. According to 680 yuan, how much is the monthly coal consumption saved in the second half of the year compared with that in the first half?
6. A forest farm planted 65,438+0,480 trees the year before last. The number of trees planted last year was twice that of the year before. The number of trees planted this year is 420 more than that planted in the previous two years. How many trees have been planted this year?
7. Two water pipes simultaneously release water into the pool. The discharge of the thick pipe is15t per hour, and that of the thin pipe is 1 1 ton per hour. How many tons of water can this pool hold in eight hours? (two calculation methods)
8. One ton
It can produce 700 kilograms of paper. If one kilogram of paper can be made into 25 exercise books, it will be 12 tons.
How many exercise books can the produced paper be made into?
9. It takes 4 tapes to record a Qigong report, and it takes 30 minutes to record a full tape. How many hours has this report been recorded?
10 and 28 rows of seeders have a width of 4m. Tractor traction, 5 kilometers per hour, how many hectares can be sown in 5 hours?