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" If two men start from the same place, and travel in opposite directions, the one traveling at the rate of 3 miles an hour, and the other at the rate of 4 miles an hour, how far apart will they be at the end of 5 hours ? 11. "
Elementary Arithmetic - Σελίδα 162
των William W. Speer - 1897 - 314 σελίδες
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