SOLUTION: an airplane climbed at an average vertical speed of 300 feet per minute and descended immediately at an average speed of 25 miles per hour. The flight was performed in 25 minutes.

Question 901126: an airplane climbed at an average vertical speed of 300 feet per minute and descended immediately at an average speed of 25 miles per hour. The flight was performed in 25 minutes. What altitude did the plane reach? (1 mile= 5,280 ft)
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
an airplane climbed at an average vertical speed of 300 feet per minute and descended immediately at an average speed of 25 miles per hour. The flight was performed in 25 minutes. What altitude did the plane reach?
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25 mi/hr = 25*22*60/15 ft/min = 2200 ft/sec
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Avg speed of the round trip = 2*300*2200/(300+2200) = 528 ft/min
RT distance = 25*528 = 13200 feet
Altitude = 6600 feet

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