Question Details

Govind starts from Point A and drives 5 km towards south. He then takes a left turn, drives 5 km, turns left and drives 12 km. He then takes a left turn and drives 11 km. He takes a final left turn, drives 7 km and stops at Point P. How far (shortest distance) and
towards which direction should he drive in order to reach Point A again? (All turns are 90° turns only unless specified.)

Options

A

6 km to the east

B

5 km to the west

C

6 km to the west

D

5 km to the east

Show Answer

Correct Answer :

Option A

6 km to the east

Solution :

The correct option is 6 km to the east.

To find how far and in which direction Govind needs to drive to return to Point A from Point P, let us track his movement step-by-step using a 2D Cartesian coordinate system.
Let Point A be at the origin (0,0).

Step 1: Initial position and first movement
Govind starts at Point A (0,0) and drives 5 km towards South.
Coordinates after 1st movement = (0,-5).

Step 2: Second movement
Facing South, he takes a left turn (which means driving towards East) and drives 5 km.
Coordinates after 2nd movement = (0+5,-5)=(5,-5).

Step 3: Third movement
Facing East, he takes a left turn (which means driving towards North) and drives 12 km.
Coordinates after 3rd movement = (5,-5+12)=(5,7).

Step 4: Fourth movement
Facing North, he takes a left turn (which means driving towards West) and drives 11 km.
Coordinates after 4th movement = (5-11,7)=(-6,7).

Step 5: Final movement to Point P
Facing West, he takes a final left turn (which means driving towards South) and drives 7 km.
Coordinates of Point P = (-6,7-7)=(-6,0).

Step 6: Direction and distance required to reach Point A
Govind is currently at Point P (-6,0) and wants to reach Point A (0,0).
The horizontal displacement required is:

0-(-6)=6 km

Since his x-coordinate needs to increase from -6 to 0, he must drive 6 km towards the East to reach Point A.

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