The cat got a 15/60=<<15/60=.25>>.25 hour head start

That means it ran 20*.25=<<20*.25=5>>5 miles

The rabbit goes 25-20=<<25-20=5>>5 mph faster than the cat

So it takes 5/5=<<5/5=1>>1 hour for the rabbit to catch up

# Answer

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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Tom's rabbit can run at 25 miles per hour.  His cat can run 20 miles per hour.  The cat gets a 15-minute head start.  In hours, how long will it take for the rabbit to catch up?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
1
Tom's rabbit can run at 25 miles per hour.  His cat can run 20 miles per hour.  The cat gets a 15-minute head start.  In hours, how long will it take for the rabbit to catch up?
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