New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    Pooja used to solve 36 problems in 72 minutes. After her

    efficiency decreased by 33.33%, how long will she now take to solve the same number of problems?
    A 145 mins Correct Answer Incorrect Answer
    B 116 mins Correct Answer Incorrect Answer
    C 108 mins Correct Answer Incorrect Answer
    D 120 mins Correct Answer Incorrect Answer

    Solution

    ATQ,

    72 minutes

    Initial efficiency = 72 ÷ 36 = 2 minutes/problem

    New efficiency = 72 ÷ (36 × 0.6667) = 3 minutes/problem

    Time to solve 36 problems = 3 × 36 = 108 minutes

    Alternate Solution:

    Efficiency ratio = 0.6667:1 = 2:3

    Time ratio = 3:2

    Required time = 72 × (3/2) = 108 minutes

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