Calculate Distance Puzzle

Calculate Distance Puzzle - 22 July

Two friends plan to meet. They both own a bike and hops on to their respective bikes and kick start the journey together deciding to meet halfway. Each of them is riding at 6 MPH and their houses are 36 miles apart from each other. One of them has a dog who also begins running at that very instant. The dog keeps running back and forth at 18 MPH from one friend to another till they meet at the half way.

Can you calculate the distance that the dog has traveled in total?

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