Stefan and Elena start walking Westwards from a certain point.
After covering 20 km, Stefan turns right and Elena turns left.
Stefan waits for sometime and then walks another 10 km,
whereas Elena walks only 5 km.
Henceforth they both start walking Southwards and cover 15 km each.
How far is Stefan from Elena?
- 10km
- 15km
- 30km
- 25km