[b]Q4.[/b] A man travels from town $A$ to town $E$ through $B,C$ and $D$ with uniform speeds 3km/h, 2km/h, 6km/h and 3km/h on the horizontal, up slope, down slope and horizontal road, respectively. If the road between town $A$ and town $E$ can be classified as horizontal, up slope, down slope and horizontal and total length of each typr of road is the same, what is the average speed of his journey?
\[(A) \; 2 \text{km/h}  \qquad (B) \; 2,5 \text{km/h} ; \qquad (C ) \;  3 \text{km/h} ; \qquad (D) \; 3,5 \text{km/h} ; \qquad (E) \; 4 \text{km/h}.\]
1. Let the length of each segment \( AB = BC = CD = DE \) be \( x \) km. Then the total distance of the journey from \( A \) to \( E \) is \( 4x \) km.

2. Calculate the time taken for each segment:
   - For segment \( AB \) (horizontal road), the speed is \( 3 \) km/h. The time taken is:
     \[
     t_{AB} = \frac{x}{3} \text{ hours}
     \]
   - For segment \( BC \) (up slope), the speed is \( 2 \) km/h. The time taken is:
     \[
     t_{BC} = \frac{x}{2} \text{ hours}
     \]
   - For segment \( CD \) (down slope), the speed is \( 6 \) km/h. The time taken is:
     \[
     t_{CD} = \frac{x}{6} \text{ hours}
     \]
   - For segment \( DE \) (horizontal road), the speed is \( 3 \) km/h. The time taken is:
     \[
     t_{DE} = \frac{x}{3} \text{ hours}
     \]

3. Sum the times for all segments to get the total time:
   \[
   t_{\text{total}} = t_{AB} + t_{BC} + t_{CD} + t_{DE} = \frac{x}{3} + \frac{x}{2} + \frac{x}{6} + \frac{x}{3}
   \]

4. Simplify the total time:
   \[
   t_{\text{total}} = \frac{x}{3} + \frac{x}{2} + \frac{x}{6} + \frac{x}{3} = \frac{2x}{6} + \frac{3x}{6} + \frac{x}{6} + \frac{2x}{6} = \frac{8x}{6} = \frac{4x}{3} \text{ hours}
   \]

5. Calculate the average speed using the formula \( r = \frac{d}{t} \):
   \[
   r = \frac{4x}{\frac{4x}{3}} = \frac{4x \cdot 3}{4x} = 3 \text{ km/h}
   \]

Thus, the average speed of his journey is \( \boxed{3} \) km/h.