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20 February, 16:20

A mine elevator was at a depth of - 120 feet. After 15 seconds, the mine elevator was at a depth of - 30 feet. Which expression shows how to find the speed of the mine elevator in feet per second?

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  1. 20 February, 17:55
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    -120 + - 30 = 90. 90/15 = 6

    Answer; 6mph
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