A Man And A Dog Problem

A man is taking his dog for a walk. They set off together for a waterfall 10 miles away. They set off exactly together and the man walks at a steady 4 miles an hour. The dog runs off at 8 miles an hour and when it reaches the waterfall it turns round and runs back to the man. When it reaches the man it turns round and runs back to the waterfall and so on until the man and dog arrive at the waterfall.

When did they both arrive at waterfall ?

Post your answer in comments.

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Azad Shaikh

Azad Shaikh is an internet geek at heart. Azad like to write about anything related to computers, internet, hacking, business and marketing. He is a computer engineering graduate and certified ethical hacker.
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    I tried going on this website earlier today and I got a 502 bad gateway error.

    • We were changing web host. we had also changed our permalinks. Sorry about this.