Greeshma stands facing west. She turns to her right and walks 5 km. Then she turns right again and walks 7 km. Then she turns south and walks another 2 km. How many more kilometres will she need to walk in the south direction, after which, if she turns right and walks another 7 km, she will reach the starting point of her journey?

Natraj starts from Point Y and drives 19 km towards the North. He then takes a right turn, drives 75 km, turns right and drives 42 km. He then takes a right turn and drives 33 km. He takes a right turn, drives 89 km. He then turns left, drives 42 km to stop at Point Z. How far (shortest distance) and towards which direction should he drive in order to reach Point Y again?

Chaitanya starts from Point Y and drives 15 km towards the South. He then takes a left turn, drives 16 km, turns right and drives 56 km. He then takes a left turn and drives 35 km. He takes a left turn, drives 29 km. He then turns right, drives 27 km, turns left and drives 42 km to stop at Point Z. How far (shortest distance) and towards which direction should he drive in order to reach Point Y again?