Question
A thief noticed a policeman at a distance of 600 metres.
The thief started running and the policeman chased him. The thief and policeman are running at speeds of 12 km/h and 15 km/h, respectively. Find the time (in minutes) required for the policeman to catch the thief.Solution
Convert speeds to m/s: Thief: 12 km/h =12 Ć (1000/3600) =10/3 m/sĀ Policeman: 15 km/h = 15 Ć (1000/3600) = 25/6 m/sĀ Relative speed: 25/6 ā 10/3 = 5/6 m/s Time to catch thief: Time = Distance/Relative speed = 600/(5/6) = 720 seconds = 12 minutesĀ
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