Question

    Reena reaches a party 20 minutes late if she walks at

    the speed of 3 km/h from her house. If she increases her speed to 4 km/h, she will reach 30 minutes early What is the distance between her home and the venue?
    A 30 km Correct Answer Incorrect Answer
    B 10 km Correct Answer Incorrect Answer
    C 40 km Correct Answer Incorrect Answer
    D 20 km Correct Answer Incorrect Answer

    Solution

    ATQ, Let distance = x km. Time taken at 3 kmph : dist/speed = x/3 = 20 min late. time taken at 4 kmph : x/4 = 30 min earlier difference between time taken : 30-(-20) = 50 mins = 50/60 hours. x/3- x/4 = 50/60 x/12 = 5/6 x = 10 km.

    Practice Next