The calculation that will give you the speed as a unit rate is 250 - 8.7 250 + 8.7 250 x 8.7 250 ÷ 8.7

A unit rate tells how much of one quantity there is for 1 unit of another quantity. To find speed, divide the distance by the time: 250 ÷ 8.7. So the correct choice is 250 ÷ 8.7.

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