Answer :

**Formula Used:**

The distance between two planes: ax + by + cz + d_{1} = 0 and ax + by + cz + d_{2} = 0 is given by** **Given planes are, 2x - y + 2z = 5 and 5x - 2.5y + 5z = 20

Now, Writing both equations of the plane in general form we have,

2x - y + 2z - 5 = 0

5x - 2.5y + 5z - 20 = 0

On dividing above equation by 2.5, we can re-write it as

2x - y + 2z - 8 = 0

Now, we can apply the formula and we have

a = 2, b = -1, c = 2, d

_{1}= -5 and d

_{2}= -8

therefore, Distance

Hence, distance between given two planes is 1 unit.

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