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

    Question

    14 chefs can cook 21 meals in 7 hours. How much time will

    10 chefs take to cook 30 meals?
    A 25 hrs Correct Answer Incorrect Answer
    B 10 hrs Correct Answer Incorrect Answer
    C 14 hrs Correct Answer Incorrect Answer
    D 28 hrs Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let the efficiency of each chef be 'x' meals per hour

    Let the required time be 't' hours

    Therefore, (14x × 7) / 21 = (10x × t) / 30

    Or, t = (14x × 7 × 30) / (10x × 21) = 14

    Required time = 14 hours

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