general Maths Puzzle

I m chasing a thief. The thief has a head start of 13 miles over me.i have a speed 1.5mile/hr greater than the thief. my dog has a speed of 13km/hr. My dog runs to and from between me and the thief. How many miles does my dog run, before i catch the thief?

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general Other Question
A and B run a kilometer and A wins by 23 Seconds. A and C run a kilometer and A wins by 273 m. When B and C run the same distance B wins by 28 seconds. The time taken by A to run a kilometer is ? A three digit number consists of 9,x and y . When these digits are reversed and then subtracted from the original number the answer yielded will be consisting of the same digits arranged yet in a different order. What is the digits which x and y carry?