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A dog starts chasing to a cat 2 hours later. It takes 2 hours to dog to catch the cat. If the speed of the dog is 30 Km/h. What is the speed of the cat?

10 km/h
15 km/h
20 km/h
can't be determined

Correct Answer: 15 km/h

Explanation:

Time = Distance advanced / Relative speed
2 = 2x / (30 - x)
⇒ x = 15 km/h

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