# SOLUTION: 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 p

Algebra ->  -> SOLUTION: 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 p      Log On

 Ad: Mathway solves algebra homework problems with step-by-step help! Ad: Algebrator™ solves your algebra problems and provides step-by-step explanations!

 Question 580945: 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?Answer by ankor@dixie-net.com(16523)   (Show Source): You can put this solution on YOUR website!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? : Let = time (in minutes) for this to be true ; 40t + 520 = 3800 - 120t 40t + 120t = 3800 - 520 160t = 3280 t = 3280/160 t = 20.5 minutes : : Check this, find at what altitude they are equal 40(20.5) + 520 = 3800 - 120(20.5) 820 + 520 = 3800 - 2460 1340 = 1340