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    Question

    A policeman sees a thief from a distance of 68 m. The

    thief starts running and the policewoman chases him.  The thief and the policeman run at the speed of 4 m/s and 9 m/s respectively. How much time did the policeman take to catch the thief? 
    A 18.9 seconds Correct Answer Incorrect Answer
    B 14.5 seconds Correct Answer Incorrect Answer
    C 13.6 seconds Correct Answer Incorrect Answer
    D 20.6 seconds Correct Answer Incorrect Answer

    Solution

    Given: Distance between police and thief = 68 meters Speed of thief = 4 m/s Speed of police = 9 m/s Since both are moving in the same direction, we subtract their speeds: Relative speed = Speed of police - Speed of thief = 9 m/s - 4 m/s = 5 m/s Time = Distance / Relative speed Time = 68 meters / 5 m/s = 13.6 seconds

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