Explanation:

- Zakia's average speed is 5 km/h.

- She gives a 20 m head start to Veena in a 200 m race.

- Zakia finishes the race 18 seconds before Veena.

- To find Veena's average speed, convert Zakia's speed to meters per second: \(5 \text{ km/h} = \frac{5000 \text{ m}}{3600 \text{ s}} \approx 1.39 \text{ m/s}\).

- Zakia covers 200 m, therefore time = \(\frac{200}{1.39} \approx 144 \text{ seconds}\).

- Veena covers 180 m in \(144 + 18 = 162 \text{ seconds} \).

- Veena's speed = \(\frac{180}{162} \approx 1.11 \text{ m/s}\).

- Convert Veena's speed to km/h: \(1.11 \text{ m/s} \approx 4 \text{ km/h}\).

- The correct option is 4 km/h.