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It seems like you are presenting several mathematical problems. Let's take a closer look at each one and provide solutions step by step.

Problem 1

You have a mathematical expression: \( 3a - 0.8 \). Given \( a = 0.5 \) and \( a = 2 \), we will calculate:

1. When \( a = 0.5 \): \[ 3(0.5) - 0.8 = 1.5 - 0.8 = 0.7 \]

2. When \( a = 2 \): \[ 3(2) - 0.8 = 6 - 0.8 = 5.2 \]

Problem 2

You need to find the average speed (OyKBeHHOe BbIpaxeHHe) of a journey with the distance of 11.3 km and time of 4 hours. Average speed is calculated as:

\[ \text{Average speed} = \frac{\text{Distance}}{\text{Time}} \]

For your case: \[ \text{Average speed} = \frac{11.3 \text{ km}}{4 \text{ hours}} = 2.825 \text{ km/h} \]

Problem 3

You need to solve the following equations:

1. \( x = 22 \)

2. \( 5 - y = 4 \)

   • Rearrange: \( y = 5 - 4 = 1 \)

3. \( 8.5 : x = 0.1 \)

   • This means \( \frac{8.5}{x} = 0.1 \)
   • Rearrange: \[ 8.5 = 0.1x \implies x = \frac{8.5}{0.1} = 85 \]

Problem 4

You have the expression \( 4.5a - 5b \) with \( a = 5, b = 1.5 \): \[ 4.5(5) - 5(1.5) = 22.5 - 7.5 = 15 \]

Problem 5

This problem might be related to a percentage calculation based on ratios. You mentioned a tax rate of 40% and a rate of 60%. Assuming you want to calculate the total "effective" tax closure, you could do this in the context of a more extensive scenario. However, the specific relationship between the two percentages and the question's structure isn't clear. More context is needed for the exact calculation.

Problem 6

You have the expression \( 178.87 - (b - 13.4) = 174.77 \): To solve for \( b \):

1. Rearrange the equation: \[ 178.87 - 174.77 = b - 13.4 \] \[ 4.1 = b - 13.4 \]
2. Solve for \( b \): \[ b = 4.1 + 13.4 = 17.5 \]

If you have more details or specific contexts for Problem 5 or need any additional clarifications, please let me know!