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" 7. Two men start from the same place and travel in opposite directions : one travels 3 miles an hour, and the other 4 miles an hour ; how far apart will they be at the end of 1 hour ? of 2 hours ? of 5 hours "
An Intellectual Arithmetic: With an Introduction to Written Arithmetic - Σελίδα 40
των George Augustus Walton, Electa N. L. Walton - 1869 - 176 σελίδες
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