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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 take the two planes to be at the same altitude?

 Feb 15, 2020
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Let the number of minutes when they will be at the same altitude =M

 

520 + 40M =3800 - 120M, solve for M

M =41/2 =20.5 minutes - when both planes will be at 1340 feet.

 Feb 15, 2020

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