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.
An Intellectual Arithmetic: With an Introduction to Written Arithmetic - Σελίδα 40
των George Augustus Walton - 1869 - 176 σελίδες
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