A thief is spotted by a policeman from a distance of 100 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?  Select:
A) 350m
B) 200m
C) 400m
D) 500m
E) None of them
Relative speed of the policeman = (10-8) km/hr =2 km/hr.   Time taken by police man to cover   (100m/1000) x 1/2 hr = 1/20 hr.   In 1/20 hrs, the thief covers a distance of 8 x 1/20 km = 2/5 km = 400 m   Answer is 400m.
<result>C</result>
A thief is spotted by a policeman from a distance of 100 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?