A thief is noticed by a policeman from a distance of 200 metres the thief starts running and the policeman chases him. The thief and the policeman run at the rate of 10 km/hr and 11 km/hr respectively. What is the distance between them after 6 minutes ?

Answer: Option A

Relative speed of policeman with respect to thief = (11 - 10) = 1 Km/hr
Now the relative distance covered by policeman in 6 min
$$\begin{array}{rl}& =\text{Speed}\times \text{Time}\\ & =1\times \frac{6}{60}\\ & =\frac{1}{10}\text{km}\\ & =100\text{m}\end{array}$$
The distance between the policeman and thief after 6 min
= 200 - 100
= 100 m