If a bike moving at the speed of x km/hr travels a distance of y km, which of the following cannot be equal to the distance traveled? Choose the correct option:
A) x-y km
B) x/2 km
C) y-x km
D) y/x km
E) (x-y)/2 km
This question can be solved by TESTing VALUES, but there's a particular pattern that you have to recognize to make the workeasy.   We're not really limited by anything in this question, so X and Y can be anything. Under normal circumstances, I won't TEST the number 1 in PS questions (as it often leads to duplicate answers), but here it's a great option (since we're looking to eliminate 4 answers, multiple TESTs are going to be likely anyway).   We're given information on speed (X km/hour) and distance (Y km). We're asked which of the 5 answer choices CANNOT be the distance traveled.   IF....   X = 2 and Y = 1   Answers A (2-1 = 1) and B (2/2 = 1) are POSSIBLE. Eliminate A and B.   IF....   X = 3 and Y = 1   Answer E ([3-1]/2 = 1) is POSSIBLE. Eliminate E.   IF....   X = 1 and Y = 1   Answer D (1/1 = 1) is POSSIBLE. Eliminate D.   Final Answer:   y-x km
<result>C</result>
If a bike moving at the speed of x km/hr travels a distance of y km, which of the following cannot be equal to the distance traveled?