1. The charging standard for a parking lot is: (1) 1 hour in 2.5 yuan. (2) If it exceeds 1 hour, 2.50 yuan will be charged for every 0.5 hour. Uncle Li paid 20 yuan in this parking lot. How many hours did Uncle Li park in this parking lot? A ship is sailing from Port A to Port B, with a planned speed of 20 kilometers per hour, but actually it has traveled 2.4 kilometers more than planned. The trip takes 4.5 hours, and there is still 1 1 km from Port B. How many kilometers is it from AB to Hong Kong? A conference room needs 500 square bricks with a side length of 0.4 meters. How many bricks do you need if you use a square brick with a side length of 0.5 meters? 1. Xiaohong bought a pen with a unit price of 4.5 yuan, paid 20 yuan and found 6.5 yuan. How many pens did she buy?

2. The area of triangle is 36.4 square meters, and its base length is 10.4 meters. What is its height?

3. There is a right triangle with two right-angled sides of 30 cm and 40 cm respectively, and its hypotenuse is 50 cm. What is the height of the hypotenuse in centimeters?

Xiao Wang walks 40 meters per minute and Xiao Zhang walks 50 meters per minute. They go from a to B. Xiao Li rides 150 meters every minute from B to A. The three of them start at the same time. 1 After Xiao Zhang and Xiao Li meet, Xiao Wang knows Xiao Li. So, how many minutes does it take Xiao Li to go from B to A by bike? (Numbers are reserved as integers)

Two trucks carry trees to town. The first car drove from the village to the town at a speed of 30 kilometers per hour, and the second car drove from the village to the town at a speed of 12 minutes per hour. As a result, two people arrived at the same time How far is it from the village to the town?

12× 30 = 360km40-30 =10km360 ~10 = 36 hours.

36× 40 =1440km

Answer: 1440km

16, Xiaohua, Xiaoli and Xiaolin went from place A to place B. At 6 o'clock in the morning, Obana Xiaoli set off from place A together. Xiaohua was 5 kilometers per hour, Xiaoli was 4 kilometers per hour, and Xiaolin didn't set off from place A until 8 o'clock in the morning. By 6 pm, Kobayashi Takeru arrived at B at the same time. When did Xiao Lin catch up with Xiao Li?

5×2 = 12×5 = 60km 60 ~ 10 = 6km 4×2 = 8km。

8~(6-4)=4 hours 6+4= 10 hour

A: Morning 10

17, Xiao Wang walked along the service road next to the railway. A train came behind and passed Xiao Wang for 7 seconds. Train conductor 105 meter, speed 72 kilometers per hour. How many meters does Xiao Wang walk per second?

72~60= 1。 2 kilometers, 1. 2 km =1200m1200 ~ 60 = 20m

7×20 = 140m( 140- 105)~ 7 = 5m。

18. The still water speed of the ship is 20 kilometers per hour, and the river speed is 5 kilometers per hour. The ship spent eight hours going back and forth between AB and Hong Kong. How many kilometers are they apart?

A: 75 kilometers.

19, Zhang Hua bought a batch of vegetable oil and put it in barrels A and B, but neither barrel was full. If bucket A is poured into bucket B and bucket B is full, bucket A will be more 10 liter; If barrel B is poured into barrel A, barrel A can be filled with another 20 liters. The capacity of barrel A is 2.5 times that of barrel B. How many liters of oil did Zhang Huayi buy?

Answer: 22 liters of oil.

20. There are three plots A, B and C, with an area of 4 hectares, 8 hectares and 10 hectares respectively. The grass on the grass is as thick and grows as fast. Land A can feed 24 cows for 6 weeks, and land B can feed 36 cows 12 weeks. How many weeks can land C feed 50 cows?