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20 May, 21:23

One plane at 520 feet is ascending at a rate of 40 feet per minute. While another plane at 3800 feet is descending at a rate of 120 feet per minute. How long will it take the two planes to be at the same altitude?

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  1. 21 May, 00:23
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    20.5 mins

    Step-by-step explanation:

    520 + 40m = 3800 - 120m

    160m = 3280

    m = 20.5 mins
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