Reena drives 10 km towards North, then turns to her right to travel 20 km. She again turns right and moves 7 km before travelling 15 km to her right.…

Let the starting point be at the origin (0, 0) with Reena initially facing North.

Starting position: (0, 0), facing North

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Drives 10 km towards North:
New position: (0, 10)
Still facing: North

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Turns right and travels 20 km:
Right turn from North → facing East
New position: (0 + 20, 10) = (20, 10)
Now facing: East

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Turns right and moves 7 km:
Right turn from East → facing South
New position: (20, 10 - 7) = (20, 3)
Now facing: South

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Travels 15 km to her right:
Right turn from South → facing West
New position: (20 - 15, 3) = (5, 3)
Now facing: West

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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)

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The distance between starting point (0, 0) and end point (5, 0) is:

Distance $= \sqrt{(5-0)^2 + (0-0)^2}$=(5−0)2+(0−0)2​

Distance $= \sqrt{25 + 0}$=25+0​

Distance $= \sqrt{25}$=25​

Distance $= 5$=5 km

Therefore, the distance between the starting point and the end point is 5 km.