1 Answers
Option 1 : A and B live on the same street
[ alt="F2 S.Y Madhu 21.03.20 D7" src="//storage.googleapis.com/tb-img/production/20/04/F2_S.Y_Madhu_21.03.20_D7.png" style="width: 406px; height: 348px;">
When A comes out of his house he is facing East and then turns left so faces North.
When B comes out of his house he is facing west and then turns left so faces South.
1) C and D live on the same street → Definite(As it is given that they live on a road going north-south)
2) C’s house faces south. → Not definite
3) Houses of C & D are less then 20 km apart. → Not definite (Difference between A and B is not given)
4) None of the above. → Not possible as third option is definite.
Hence, A and B live on the same street.