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" hours ? 8. Two men start from the same place, and travel in the same direction, one at the rate of 2 miles an hour, and the other at the rate of 12 miles an hour ; how far apart will they be in 1 hour ? in 2 hours ? in 4 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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