The distance between them is $$100$$ m, and the difference between their speeds is $$12-8=4000$$ m/h. It takes $$100\div4000\times60=1.5$$minutes to catch the burglar, which is $$90$$ seconds 
A police spotted a burglar from $$100\text{m}$$ apart. The burglar immdiately runs away at a speed of $$4\text{m/s}$$ and the police starts chasing him at $$8\text{m/s}$$ at the same time. At this rate, how long will it take the police to catch the burglar? 
[1] $$1 $$ minute 
[2] $$25 $$ seconds 
[3] $$30$$ seconds 
[4] $$15$$ seconds 