Let's break down Prakash's movements step by step:
1. Prakash walked 30 m towards the West.
This means he initially faced towards the East and moved 30 m in the opposite direction, which is West.
2. Prakash took a left turn and walked 20 m.
After taking a left turn from the West, he would be facing South and walked 20 m in that direction.
3. Prakash took another left turn and walked 30 m.
Since he was facing South, taking a left turn would make him face East. He then walked 30 m in the East direction.
4. Prakash took a right turn and stopped.
After facing East, taking a right turn would make him face South.
Therefore, when Prakash stopped, he was facing the South direction.