**Solution:**

Given height of the pole = 6 m

Length of shadow of the pole = 4 m

Let the angle be θ

tanθ = 6/4 = 3/2 → (1)

Given length of shadow of the tower = 28 m

Let the length of shadow of the tower be x

tanθ = x/28 → (2)

From (1) and (2), we get

3/2 = x/28

x = 28*3/2 = 42 m

**Therefore, the length of the tower is 42 m**