One day, Ravi left home and cycled 10 km southwards, turned right and cycled 5 km, turned right again and cycled 10 km, and finally turned left and cycled 10 km. How many kilometers will he have to cycle to reach his home straight?

A person 'X' started from his home and walked 3 km straight. Then he turned right and walked 2 km. He turned right again and walked 1 km. If he is now in the North-West direction relative to his house, in which direction did he walk in the beginning?

Ramu starts from his house, moves towards the east, walks 90 m, turns right and moves 20 m. He turns right again and moves 30 m. Finally, he turns right and walks 100 m. In which direction should he walk to reach his house again?