Discussion
Your house is located at X and your school is located at Y. Although your school is just opposite but you cannot go straight because of the busy highway in between. So, you first go 125 m due south, then cross a 100 m long subway which is due east and finally reach your school at Y which is 125 m due north. With respect to school at Y your house at X is
Answer: C
With respect to the school at Y, the house at X is 100 m due west.
Trace the route. From X you go 125 m south, then 100 m east, then 125 m north. The southward and northward legs cancel, so the net movement is 100 m east: Y is 100 m east of X.
Seen from Y, the direction is reversed: X is 100 m due west. The option 100 m due east is the position of Y from X, the reverse of what is asked. The 125 m options take one of the legs that cancel out as if it were the final displacement.
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