Samantha and Rachel decided to meet at a park that is 40 kilometers away from each of their homes. Samantha left her house on her bike traveling at 15 km/h, while Rachel left her house at the same time walking at 5 km/h. If Samantha takes a break for 1 hour during her journey, how long will it take for both of them to meet at the park? Let's think step by step and output the final answer within \boxed{}.
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