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Omni-MATH / Anca and Bruce left Mathville at the same time. They drove along a straight…

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Anca and Bruce left Mathville at the same time. They drove along a straight highway towards Staton. Bruce drove at $50 \mathrm{~km} / \mathrm{h}$. Anca drove at $60 \mathrm{~km} / \mathrm{h}$, but stopped along the way to rest. They both arrived at Staton at the same time. For how long did Anca stop to rest?
Plain-text mathematical notation (without MathML)
Anca and Bruce left Mathville at the same time. They drove along a straight highway towards Staton. Bruce drove at $50 \mathrm{~km} / \mathrm{h}$. Anca drove at $60 \mathrm{~km} / \mathrm{h}$, but stopped along the way to rest. They both arrived at Staton at the same time. For how long did Anca stop to rest?
Original LaTeX notation
Anca and Bruce left Mathville at the same time. They drove along a straight highway towards Staton. Bruce drove at $50 \mathrm{~km} / \mathrm{h}$. Anca drove at $60 \mathrm{~km} / \mathrm{h}$, but stopped along the way to rest. They both arrived at Staton at the same time. For how long did Anca stop to rest?

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