Let the starting point be at the origin (0, 0) with Reena initially facing North.
Starting position: (0, 0), facing North
Drives 10 km towards North:
New position: (0, 10)
Still facing: North
Turns right and travels 20 km:
Right turn from North → facing East
New position: (0 + 20, 10) = (20, 10)
Now facing: East
Turns right and moves 7 km:
Right turn from East → facing South
New position: (20, 10 - 7) = (20, 3)
Now facing: South
Travels 15 km to her right:
Right turn from South → facing West
New position: (20 - 15, 3) = (5, 3)
Now facing: West
Takes a left turn and goes 3 km:
Left turn from West → facing South
New position: (5, 3 - 3) = (5, 0)
Final position: (5, 0)
The distance between starting point (0, 0) and end point (5, 0) is:
Distance =(5−0)2+(0−0)2
Distance =25+0
Distance =25
Distance =5 km
Therefore, the distance between the starting point and the end point is 5 km.