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    Question

    Reena reaches a birthday party 20 min late if she walks

    3 km/h from her house. If she increases her speed to 4 km/h she would reach 30 min early, then the distance between her house and the venue of the birthday party is:
    A 4 km Correct Answer Incorrect Answer
    B 9 km Correct Answer Incorrect Answer
    C 7 km Correct Answer Incorrect Answer
    D 10 km Correct Answer Incorrect Answer

    Solution

    Let the distance = D km. Time at 3 km/h = D/3, time at 4 km/h = D/4. Total time difference = 20+30=50 minutes = 5/6 hours.

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