Civil Services Prep

Prelims 2022 · CSAT / Quantitative Aptitude · Question 26

On one side of a 1.01 km long road, 101 plants are planted at equal distance from each other. What is the total distance between 5 consecutive plants?

  1. 40 m
  2. 40.4 m
  3. 50 m
  4. 50.5 m

Answer

40.4 m

  • Key fact: 101 plants create 100 equal gaps along a road of 1.01 km = 1010 m. So distance between two consecutive plants = 1010/100 = 10.1 m.
  • 5 consecutive plants means from the 1st to the 5th plant, there are 4 gaps. Total distance = 4 × 10.1 = 40.4 m.
  • Option (a) 40 m: assumes 10 m spacing; incorrect.
  • Option (b) 40.4 m: matches 4 gaps × 10.1 m; correct.
  • Option (c) 50 m: wrongly takes 5 gaps of 10 m; incorrect.
  • Option (d) 50.5 m: wrongly takes 5 gaps of 10.1 m; incorrect.
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