Question Details

Directions: Read the following information carefully and answer the questions given below:

Anita starts cycling from point A in the west direction. After travelling 4m, she reaches point B. From point B, she takes a left turn and rides 3m to reach point C. From point C, she turns right and travels 6m to reach point D. From point D, she takes a right turn and travels 9m to reach point E.

Benny starts cycling from point P in the north direction. After travelling 6m, he reaches point Q. From point Q, he takes a left turn and rides 5m to reach point R. From point R, he takes a left turn and rides 10m to reach point S. Now, from point S, he takes a right turn and travels 3m to reach point E.

In which direction is Benny’s initial position with respect to Anita’s final position?

Options

A

South-East

B

North

C

North-West

D

North-East

E

South-West

Show Answer

Correct Answer :

Option D

North-East

Solution :

The correct answer is North-East.

To determine the direction of Benny's initial position with respect to Anita's final position, we can trace the paths of both Anita and Benny on a standard 2D coordinate system where East is along the positive x-axis (+x), West is along the negative x-axis (-x), North is along the positive y-axis (+y), and South is along the negative y-axis (-y).

Step 1: Trace Anita's movement starting from point A

Let point A be at the origin:

A=(0,0)

1. Anita rides West for 4m to reach point B:
B=(0-4,0)=(-4,0)

2. From B, she turns left (facing West, turning left means going South) and rides 3m to reach point C:
C=(-4,0-3)=(-4,-3)

3. From C, she turns right (facing South, turning right means going West) and rides 6m to reach point D:
D=(-4-6,-3)=(-10,-3)

4. From D, she turns right (facing West, turning right means going North) and rides 9m to reach point E:
E=(-10,-3+9)=(-10,6)

Thus, Anita's final position E is located at (-10, 6).

Step 2: Trace Benny's movement starting from point P

Let Benny's starting position P be at coordinates (xP,yP).

1. Benny rides North for 6m to reach point Q:
Q=(xP,yP+6)

2. From Q, he turns left (facing North, turning left means going West) and rides 5m to reach point R:
R=(xP-5,yP+6)

3. From R, he turns left (facing West, turning left means going South) and rides 10m to reach point S:
S=(xP-5,yP+6-10)=(xP-5,yP-4)

4. From S, he turns right (facing South, turning right means going West) and travels 3m to reach point E:
E=(xP-5-3,yP-4)=(xP-8,yP-4)

Step 3: Calculate coordinates of Benny's initial position P

Since both paths end at point E, we equate the coordinates:

xP-8=-10xP=-2

yP-4=6yP=10

Therefore, point P is located at coordinates (-2, 10).

Step 4: Determine the relative direction

To find the direction of Benny's initial position P(-2, 10) relative to Anita's final position E(-10, 6):

x-displacement=-2-(-10)=+8

y-displacement=10-6=+4

A positive x-displacement means East, and a positive y-displacement means North. Thus, Benny's initial position P is in the North-East direction with respect to Anita's final position E.

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