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      Question

      Priya can solve 30 questions in 1.5 hours. If she decreased

      her efficiency by 25%, then how much time would she take to solve the same number of questions?
      A 124 mins Correct Answer Incorrect Answer
      B 116 mins Correct Answer Incorrect Answer
      C 128 mins Correct Answer Incorrect Answer
      D 120 mins Correct Answer Incorrect Answer

      Solution

      ATQ,

      1.5 hours = 90 minutes

      Initial efficiency of Priya = 90 ÷ 30 = 3 minutes/question

      New efficiency of Priya = 90 ÷ (30 × 0.75) = 4 minutes/question

      So, time required to finish 30 questions = 4 × 30 = 120 minutes

      Alternate Solution:

      Ratio of new efficiency to old efficiency = 0.75:1 = 3:4

      Therefore, ratio of time taken now to time taken initially = 4:3

      Required time taken = 90 × (4/3) = 120 minutes

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