SOLUTION: airplane at 19,200 feet descending at a rate of 40 feet per second. Another airplane takes off and ascends at a rate of 60 feet per second. After how many seconds will the airplane
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Question 1152719: airplane at 19,200 feet descending at a rate of 40 feet per second. Another airplane takes off and ascends at a rate of 60 feet per second. After how many seconds will the airplanes be at the same height? What is the height? Answer by ikleyn(52778) (Show Source):
Your equation is
19200 - 40x = 60x
expressing rime x in seconds when the heights are equal.
Simplify and solve
19200 = 60x + 40x
19200 = 100x
x = = 192 seconds.
