Jack and Jill drove in separate cars to their favorite hill, leaving from the same place at the same time

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Jack and Jill drove in separate cars to their favorite hill, leaving from the same place at the same time. Jill drove 20% faster than Jack and arrived half an hour earlier. How many hours did Jack drive?

    • 11 years ago
    Jack and Jill drove in separate cars to their favorite hill, leaving from the same place at the same time
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