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4.A thief saw a policeman from distance of 700m and started running.Thief could run 4.7km in 41 minutes & policeman can run the same distance in 34 minutes.Find the distance thief had run before being caught. |
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Answer» Given :- A thief saw a policeman from distance of 700m and started running. Thief could run 4.7km in 41 minutes & policeman can run the same distance in 34 minutes. Find the distance thief had run before being CAUGHT. Solution :- → Thief runs = 4.7 km = 4.7 * 1000 = 4700 m. → Time taken = 41 min. = → speed of thief = (Distance/time) = (4700/41) m / min. similarly, → Policeman runs = 4.7 km = 4.7 * 1000 = 4700 m. → Time taken = 34 min. → speed of Policeman = (Distance/time) = (4700/34) m / min. then, → usual speed in same direction = speed of Policeman - speed of thief = (4700/34) - (4700/41) ={4700(41 - 34)} /34*41 = (4700 * 7)/1394 = 23.6 m/min. therefore, → Time taken by policeman to CATCH the thief = (Distance between them) / usual speed = (700/23.6) = 29.67 minutes. hence, → Distance covered by thief before caught = speed * time = (4700/41) * 29.67 ≈ 3401 m = 3.4 km (Ans.) ∴ The distance thief had run before being caught is 3.4 km .Learn more :- A leak in the body of a ship which can admit 5 units of water in 16 minutes got detected when it is 40km away from the s... A train starting from a station X was to arrive at a station Y at 6:06 PM. It could TRAVEL at 62.5% of its usual speed a... |
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