It will be completed in 20 days, and the daily transportation capacity is 3600÷20= 180 cars.

2. Land area: 9 × 960=8640 square decimeter =86.4 square meters.

With a square brick of 4 square meters, it needs: 86.4÷4=2 1.6.

3. x blocks are needed

So 10: 40 = 60: x

x=40×60÷ 10=240

So we need 240 yuan.

4. If the dosage is x kg, the water is 150x kg.

x+ 150x=755

x=5

150x=750

So 5 Jin of medicine and 750 Jin of water.

3 kg of medicine, water is 3 × 150=450 kg.

So pesticide 3+450 = 453kg.

If there is 525 kg of water, it needs 535÷ 150=3.5 kg.

So you need to put 3.5 kilograms of medicine.