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Logical Reasoning
mediumQ. No. 19815

A rescue worker follows the route 32 km South, then 24 km West, then 20 km North, then 19 km East. What is the shortest distance from the starting camp?

Last Updated:

A13 km
B15 km
C11 km
D95 km
Correct Answer: 13 kmYour Answer: A

Explanation

Step 1: Mark the starting point as O(0,0) and choose East as +x and North as +y. | Step 2: Horizontal calculation: −24 + +19 = -5 km; hence the final point is west of O by 5 km. | Step 3: Vertical calculation: −32 + +20 = -12 km; hence it is south of O by 12 km. | Step 6: The total route is 95 km, but that is not the required shortest distance; the direct displacement is 13 km.

Important Notes

  • Use East = +x, West = −x, North = +y and South = −y. |
  • A route may be long while its displacement is small, so never add every segment unless total distance is requested. |
  • Estimate the answer before selecting an option: the displacement must be less than or equal to the route length. |

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