A thief is spotted by a policeman from a distance of 100metres. When the policeman starts the chase, the thief also starts running. If the speed of the thief be 16km/hr and that of the policeman 20km/hr, how far the thief will have run before he is overtaken ?	Choose the correct choice from the following answers:
A) A)1km B) B)500m C) C)650m D) D)750m E) E)400m
Relative speed of the policeman = 20-16= 
<gadget id="calculator">20-16</gadget>
<output>4</output>
4 km/hr   time taken by policeman to cover 100m= (100/1000)*(1/4) = 1/40 hr   In 1/40 hr the thief covers a distance of 16/40 km = 2/5 km = 400m   Answer is 400m
<result>E</result>
A thief is spotted by a policeman from a distance of 100metres. When the policeman starts the chase, the thief also starts running. If the speed of the thief be 16km/hr and that of the policeman 20km/hr, how far the thief will have run before he is overtaken ?