SOLUTION: with a north wind blowing at 20 mph, a helicopter flies due north for 30 mi an then returns. if the total time was 48 min, find the helicopter's speed in still air.

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Question 606520: with a north wind blowing at 20 mph, a helicopter flies due north for 30 mi an then returns. if the total time was 48 min, find the helicopter's speed in still air.
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
with a north wind blowing at 20 mph, a helicopter flies due north for 30 mi an then returns. if the total time was 48 min, find the helicopter's speed in still air.
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Distance = 30 mi ; time = 48/60 = 4/5 hr ; rate = distance/time = 30/(4/5)
= 150/4 = 37.5 mph
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plane speed - wind speed = 37.5
plane speed - 20 = 37.5
plane speed in still air = 57.5 mph
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Cheers,
Stan H.