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Mensuration - Quant/Math - CAT 2008

  1. Algebra
  2. Progressions
  3. Averages
  4. Clocks and Calendars
  5. Data Sufficiency
  6. English Grammar
  7. Function
  8. Geometry
  9. Interest
  10. Mensuration
  11. Mixtures & Alligations
  12. Number System
  13. Percentages
  14. Permutation & Combination
  15. Pipes & Cisterns And Work & Time
  16. Probability
  17. Profit & Loss
  18. Races
  19. Ratio, Proportion
  20. Speed, Time & Distance
  21. Trigonometry
  22. Miscellaneous
  23. General Knowledge
Question 4 the day: Mensuration - March 22, 2004

The question for the day is from the topic Mensuration.
The area of a square field is 24200 sq m. How long will a lady take to cross the field diagonally at the rate of 6.6 km/hr?

(1) 3 minutes (2) 2 minutes
(3) 2.4 minutes (4) 2 minutes 40 seconds
Correct choice - (2) Correct Answer -(2 minutes)

Solution:

Let ‘a’ meters be the length of a side of the square field.

Therefore, its area = a2 square meters. --- (1)

We know that the length of the diagonal ‘d’ of a square whose side is ‘a’ meters = a –-- (2)

From (1) and (2), we can deduce that the square of the diagonal = d2 = 2a2

Or d = meters.

The time taken to cross a length of 220 meters while traveling at 6.6 kmph is given by
(converting 1 km = 1000 meters and 1 hour = 60 minutes).

= 2 minutes
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