The given question is incomplete..the correct question is

A horse starts to chase a dog that has left the stable two hours earlier. The horse runs at an average speed of 2km/hr.

Ans:starting of the question is given to waste our time.its useless

horse's average speed =2kmphhorse catches the dog after 6 hours.sototal distance travelled by horse=>>

=12km

but the

so total time taken to travel 12 km by dog is=6+2=8 hours.

By using basic

A horse starts to chase a dog that has left the stable two hours earlier. The horse runs at an average speed of 2km/hr.

**(****It crosses a 10-metre road, two small ponds 3 metres deep, and finally runs along two small streets of 200 metres long=irrelavent data)**. After traveling 6 hrs, 2hrs after sunset, it catches the dog. Compute the speed of the dog in Km/hr?Ans:starting of the question is given to waste our time.its useless

horse's average speed =2kmphhorse catches the dog after 6 hours.sototal distance travelled by horse=>>

**distance=velocity*time**=2kmph*6=12km

but the

**dog started 2 hours before**(read the question)so total time taken to travel 12 km by dog is=6+2=8 hours.

By using basic

**distance=velocity*time formula**we can get the velocity of dog**12=velocity*8velocity=12/8**=**1.5kmph**