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1. A dog start chasing to a cat 2 hour 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 cat?

Solution:
Let speed of the cat be S km/h.
Time taken = Distanced advancedRelative speed
2 = 2×S30S
S = 15 km/h

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