50 meter

100 meter

110 meter

None of above

B. 100 meter

Relative speed of the thief and policeman = (11 – 10) km/hr = 1 km/hr

Distance covered in 6 minutes = $\frac{1}{60}\times 6=\frac{1}{10}=100meters$

So distance between them after 6 minutes = 200 - 100

= 100 meters