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?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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