A thief started his journey at a speed of 60 km/h. After 30 minutes, police started from the same place but at a speed of 80 km/h. How much time (in hours) will the police take to catch the thief?

A

$$\frac{3}{2}$$ hours

B

$$\frac{1}{2}$$ hours

C

$$\frac{1}{3}$$ hours

D

$$\frac{5}{2}$$ hours