2. Assuming that X machines are produced every day on average, the equation is obtained according to the meaning of the question:

600/x=450/(x-50)

Answer: x=200 (unit)

3. Assuming that X hectares of wheat are harvested every hour, the equation is obtained according to the meaning of the question:

10/x = 10/[(x/ 150)* 100]- 1

Solution: x=5 (hectare)

4. Let the driving speed of the previous hour be x meters, and get the equation according to the meaning of the question:

180/x-2/3 =( 180-x)/ 1.5x+ 1

Solution: x=60 (km)