Question Details

Aditi departs from her home and walks 38 m towards West and then turns right and walks 19 m. Now she turns right and walks 25 m. She then takes a left turn and walks 21 m. She then takes a left turn again and walks 38 m. She takes a final left turn and walks 25 m to stop at point X. How far is she from a pole which is 15 m North of her house? (Assume that all turns are 90 degree turns only.)

Options

A

38 m

B

49 m

C

57 m

D

51 m

Show Answer

Correct Answer :

Option D

51 m

Solution :

Correct Option: 51 m

To find the distance between Aditi's final position (point X) and the pole, we can trace her path step-by-step using a standard 2D coordinate system. Let us assume Aditi's home is at the origin point (0, 0), where:
- The positive x-axis represents East (+x)
- The negative x-axis represents West (-x)
- The positive y-axis represents North (+y)
- The negative y-axis represents South (-y)

Let's calculate the coordinates after each turn:

1. Start from home:
Initial coordinates:
(0,0)

2. Walks 38 m towards West:
Since West is in the negative x-direction, the coordinates become:
(0-38,0)=(-38,0)

3. Turns right and walks 19 m:
Facing West, a right turn points North (positive y-direction). The coordinates become:
(-38,0+19)=(-38,19)

4. Turns right and walks 25 m:
Facing North, a right turn points East (positive x-direction). The coordinates become:
(-38+25,19)=(-13,19)

5. Turns left and walks 21 m:
Facing East, a left turn points North (positive y-direction). The coordinates become:
(-13,19+21)=(-13,40)

6. Turns left and walks 38 m:
Facing North, a left turn points West (negative x-direction). The coordinates become:
(-13-38,40)=(-51,40)

7. Turns left and walks 25 m to stop at point X:
Facing West, a left turn points South (negative y-direction). The final coordinates of point X are:
(-51,40-25)=(-51,15)

8. Find the position of the pole:
The pole is located 15 m North of her house (0, 0). Therefore, the coordinates of the pole are:
(0,15)

9. Calculate the distance between point X and the pole:
Notice that both point X (-51, 15) and the pole (0, 15) have the same y-coordinate (15). This means they lie on the exact same horizontal line. The distance between them is the difference in their x-coordinates:
Distance=|0-(-51)|=51 m
Thus, Aditi is exactly 51 m away from the pole.

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