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" If 2 men start from the same place, and travel in opposite directions; one at the rate of 3f miles in an hour, and the other 4 j miles; how far will they be apart at the end of 1 hour ? how far at the end... "
First lessons in arithmetic: on the plan of Pestalozzi, with some improvements - Σελίδα 131
των Warren Colburn - 1825 - 172 σελίδες
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...built on the average 4 rods a day, and the other 3 rods a day. How many days did they work ? "17. Two men start from the same place and travel in opposite directions, one 30 miles a day, and the other 20 miles a day. In how many days will they be 350 miles apart ? — 18....

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Wilbur Fisk Nichols - 1899
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