Instructions

The above is a schematic diagram of walkways (indicated by all the straight-lines) and lakes (3 of them, each in the shape of rectangles - shaded in the diagram) of a gated area. Different points on the walkway are indicated by letters (A through P) with distances being OP = 150 m, ON = MN = 300 m, ML = 400 m, EL = 200 m, DE = 400 m.

The following additional information about the facilities in the area is known.

1. The only entry/exit point is at C.

2. There are many residences within the gated area; all of them are located on the path AH and ML with four of them being at A, H, M, and L.

3. The post office is located at P and the bank is located at B.

Question 8.

One resident takes a walk within the gated area starting from A and returning to A without going through any point (other than A) more than once. What is the maximum distance (in m) she can walk in this way?

A
B
C
D
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Question Explanation

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Text Explanation

Counter to the first question, we should minimize the use of those hypotenuse walkways as they reduce the distance we travel.

The longest possible route would include then travelling through the edges of the rectangles and squares, and not touch any point more than once.

Best case scenario would be us touching each point exactly once.

This can be visualized as:


Where we do not use any of the hypotenuse and cross through each gate exactly once.

The total distance would be:

AH+HI+ IP = 400+200+400 = 1000

DE+EL+LM = 400+200+400 = 1000

PO+JK+NM = 150+300+300 = 750

DC+FG+BA = 150+300+300 = 750

JO+KN = 400+400 = 800

CF+GB = 400+400 = 800

Adding up to: 5100m

Therefore, 5100 is the correct answer.

Video Explanation

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