1.it takes 20 days for team a to complete a task alone, 24 days for team b and 30 days for team C. Team A will do it for five days, and the remaining three teams will do it. All tasks are rewarded with 6000 yuan. How much should team a take?

2. A bookstore sells a kind of calendar, and every time it sells 1 book, it can make a profit of 18 yuan. After selling some, they will be sold at a reduced price of 10 yuan, and all of them will be sold out. It is known that the books sold at a reduced price are 2/3 of the books sold at the original price, and the bookstore made a profit of 2,870 yuan after selling this calendar. Ask how many calendars the bookstore has sold.

3. A journey is divided into three sections: uphill, flat and downhill. The distance ratio of each segment is 2:3:4, and the time ratio of Xiaoxiao to complete these three segments is 4:5:6. It is known that her uphill speed is 4 kilometers per hour and the total distance is 36 kilometers. How many hours does it take to walk all the way with a smile?