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A train travels 90- miles in of an hour. What is the average speed, in miles
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4
per hour, of the train?
Use Scratchpad to show your work.

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38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)