A thief is spotted by a policeman from a distance of 160 meters. When the policeman starts the chase, the thief also starts running. If the speed of the thief be 8km/hr and that of the policeman 10 km/hr, how far the thief will have run before he is overtaken?  Choose one:
A) 350m  B) 240m  C) 440m  D) 640m  E) None of them
Relative speed of the policeman = (10-8) km/hr =2 km/hr.   Time taken by police man to cover   (160m/1000) x 1/2 hr = 2/25hr.   In 2/25 hr/s, the thief covers a distance of 8 x 2/25 km = 16/25 km = 640 m   Answer is 640m.
<result>D</result>
A thief is spotted by a policeman from a distance of 160 meters. When the policeman starts the chase, the thief also starts running. If the speed of the thief be 8km/hr and that of the policeman 10 km/hr, how far the thief will have run before he is overtaken?