Multiple choice

x can make a wall in 25 months, y can make the same wall in 35 months and z can break that wall in 45 months. How many months will it take for them to completely construct the wall once when all three of them work together?

  1. 21.58 months approx

  2. 11.01 months approx

  3. 15.75 months

  4. 14.3 months

  5. 7.3 months
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

z works negatively, so the work efficiency of x and y is reduced. This answer is correct.

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