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After defeating Clair and finishing her task to go to dragon's den, go to professor elm's house. He will say that a few kimono girls are waiting for you at the ecruteak city theatre. After reaching there, you'd be forced to fight the five of them, each holding different eevee evolutions. After winning, they would … Read more
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In one hour his father would travel 3miles(Divide both sides of 36/12 by 12)
so his son is double of that speed which would be 6miles per hour
so after 9hours, his son would travel 6milesx9hours which is equal to 54miles