Given: A policeman notices a thief from a distance of 200m . The thief starts running and the policeman chases him. The thief and the policeman run at the rate of 10km∕h and 11km∕h respectively. Formula used: Distance = Speed × Time Calculation: Distance travelled by policeman in 6min=11×(
6
60
)=1.1km=1100m Distance travelled by thief in 6min=10×(
6
60
)=1km=1000m The policeman covers distance =200−(1100−1000)=100m ∴ Required distance between them after 6minis100m .