If a bus moving at the speed of y km/hr travels a distance of x km, which of the following cannot be equal to the distance traveled?  Options:
A) y-x km B) y/2 km C) (y-x)/2 km D) x/y km E) x-y 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 (y km/hour) and distance (x km). We're asked which of the 5 answer choices CANNOT be the distance traveled.   IF....   Y = 2 and X = 1   Answers A (2-1 = 1) and B (2/2 = 1) are POSSIBLE. Eliminate A and B.   IF....   Y = 3 and X = 1   Answer C ([3-1]/2 = 1) is POSSIBLE. Eliminate C.   IF....   Y = 1 and X = 1   Answer D (1/1 = 1) is POSSIBLE. Eliminate D.   Final Answer:   x-y km
<result>E</result>
If a bus moving at the speed of y km/hr travels a distance of x km, which of the following cannot be equal to the distance traveled?