एक नदी पश्चिम से पूर्व की ओर बहती है और रास्ते में बाएं मुड़कर एक पहाड़ी के चारों ओर अर्धवृत्त बनाती है, और फिर समकोण पर बाएं मुड़ती है। नदी अंततः किस दिशा में बह रही है?

Suraj starts driving from point A and drives 4 km towards the East. Then he turns right and drives 6 km to reach point B. Parveen starts driving from point X, which is 3 km East of point B, and drives 5 km towards South. Then he turns right and drives 7 km to reach point Y. Find the shortest distance between point Y and point A. (All turns are 90-degree turns only)

Mr. DEF starts from Point A and drives 16 km towards the north. He then takes a right turn, drives 21 km, turns right and drives 13 km. He then takes a left turn, drives 15 km, turns right and drives 22 km. He then takes a right turn and drives 54 km. He takes a final right turn, drives 19 km and stops at Point P. How far (shortest distance) and towards which direction should he drive in order to reach Point A again?